HighCVE-2026-33814

    Golang.org/x/net/http2: Infinite Loop (CVE-2026-33814)

    Published Last modified Sources: Red Hat, SUSE, CVE.org, OSV, Msrc Update Guide, Ubuntu, EUVD, BSI

    What is affected, what to do

    A flaw was found in the HTTP/2 protocol implementation within the Go standard library (golang.org/x/net and net/http/internal/http2). A remote attacker can exploit this vulnerability by sending a specially crafted HTTP/2 SETTINGS frame with the SETTINGS_MAX_FRAME_SIZE parameter set to zero.

    Update Golang.org/x/net/http2 to version 0.53.0, Go standard library Net/http to version 1.25.10, Go standard library Net/http to version 1.26.3.

    Affected
    • Golang.org/x/net/http2 lt *..0.53.0
    • Go standard library Net/http lt *..1.25.10
    • Go standard library Net/http lt 1.26.0-0..1.26.3
    Fixed in
    • Golang.org/x/net/http2 0.53.0
    • Go standard library Net/http 1.25.10
    • Go standard library Net/http 1.26.3

    Not sure whether and how you are affected? Ask a question about this vulnerability

    Metrics

    7.5

    Priority

    XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.

    Source: NVD, CVSS v3

    7.5

    CVSS v3

    Severity High on the scale from 0 to 10.

    Source: Red Hat, SUSE, CVE.org, OSV, Msrc Update Guide, Ubuntu, EUVD, BSI

    0.8 %

    EPSS score

    Low — model estimates < 1% exploitation likelihood.

    Source: FIRST EPSS, percentile 57.9

    Show all metrics
    Severity
    High
    Priority (0–325)

    The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first?

    Read in glossary
    81.32 Methodology
    Exploit maturity

    An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack.

    Read in glossary
    no public PoC known
    XIEM Effective CVSS

    XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command.

    Read in glossary
    7.5 Methodology
    CVSS v3

    CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions.

    Read in glossary
    7.5
    EPSS score

    The EPSS score is the absolute model output for an individual vulnerability: the estimated probability of real-world exploitation within the next 30 days, expressed as a value between 0 and 1 (i.e. 0 % to 100 %). A score of 0.42 means „the model estimates a 42 % chance of real-world exploitation within 30 days“.

    Read in glossary
    0.8 %
    Low — model estimates < 1% exploitation likelihood.
    EPSS percentile

    The EPSS percentile is the relative position of a vulnerability within all EPSS-scored CVEs, expressed as a value between 0 and 1. A percentile of 0.90 means „this CVE has a higher EPSS score than 90 % of all other scored CVEs“. Unlike the EPSS score, it is not a probability — but a positioning within a ranking.

    Read in glossary
    57.9
    High — this CVE ranks above the median of all CVEs scored today (rank ≥ 36%).
    KEV status

    The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching.

    Read in glossary
    —
    Published
    CISA assessment (SSVC)
    Exploitation: none known · automatable · Technical impact: partial
    Source: CISA Vulnrichment, as of 8 May 2026
    CWE

    CWE is a catalogue of typical weakness types in software and hardware — such as flawed input validation, unsafe memory handling or poor authentication. Where a CVE names a concrete vulnerability in a concrete product, a CWE describes the underlying class of defect.

    Read in glossary
    CWE-835, CWE-606

    Detection rules

    No NEOSEC detection rule is available for this vulnerability yet.

    Classification under NIS2 and CRA

    Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.

    NIS2

    NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.

    Read in glossary
    High technical severity: assess and remediate the vulnerability in vulnerability handling under Art. 21(2)(e) NIS2 and document the decision.
    CRA

    The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.

    Read in glossary
    From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
    ISO/IEC 27001

    ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.

    Read in glossary
    Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.

    Description

    A flaw was found in the HTTP/2 protocol implementation within the Go standard library (golang.org/x/net and net/http/internal/http2). A remote attacker can exploit this vulnerability by sending a specially crafted HTTP/2 SETTINGS frame with the SETTINGS_MAX_FRAME_SIZE parameter set to zero. This malicious frame causes the transport layer to enter an infinite loop of writing CONTINUATION frames, leading to resource exhaustion and a Denial of Service (DoS) condition.

    Source: redhat_csaf, suse_csaf, NVD (NIST), OSV (Open Source Vulnerabilities), Microsoft Security Update Guide, Ubuntu Security Notices, ENISA EUVD, CVE.org (MITRE), cvelistv5, BSI WID Portal, BSI CSAF

    Affected products

    The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

    Affected products
    Affected versionsFixed in
    Go standard librarynet/http
    • < 1.25.10
    • 1.26.0-0 – < 1.26.3
    • 1.25.10
    • 1.26.3
    golang.org/x/netgolang.org/x/net/http2
    • < 0.53.0
    • 0.53.0
    golanggo
    • 1.26.0 – < 1.26.3
    • < 1.25.10
    • 1.26.3
    • 1.25.10
    golanghttp2
    • < 0.53.0
    • 0.53.0
    IBMConcert
    • < 3.0.0
    • 3.0.0
    OracleSolaris
    • <11.3 ESU 36.36
    • <11.4 SRU 94
    • —
    • —
    gogolang.org/x/net
    • —
    • —
    gostdlib
    • 1.26.0-0
    • —

    Vendors and products

    Weakness classes (CWE)

    • CWE-835Loop with Unreachable Exit Condition ('Infinite Loop')

      Base

      The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop.

      Entry at MITRE CWE-835
    • CWE-606Unchecked Input for Loop Condition

      Base

      The product does not properly check inputs that are used for loop conditions, potentially leading to a denial of service or other consequences because of excessive looping.

      Entry at MITRE CWE-606

    References & sources

    Changes to this CVE

    Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).

    1. Record modifiedRed Hat ADP

      1 individual change: Affected versions (publisher)

      Show the original change
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Affected versions (publisher)added
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      Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/33xxx/CVE-2026-33814.json">CVE-2026-33814</a>

      Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

    2. Record modifiedRed Hat ADP

      1 individual change: Affected versions (publisher)

      Show the original change
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Affected versions (publisher)added
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      Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/33xxx/CVE-2026-33814.json">CVE-2026-33814</a>

      Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

    3. Record modifiedRed Hat ADP

      Show the original change
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Referenceadded
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      https://access.redhat.com/errata/RHSA-2026:66350

      Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

    4. Record modifiedRed Hat ADP

      Show 2 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Affected versions (publisher)added
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      Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/33xxx/CVE-2026-33814.json">CVE-2026-33814</a>
      Referenceadded
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      https://access.redhat.com/errata/RHSA-2026:62410

      Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

    5. Record modifiedRed Hat ADP

      Show 4 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
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      Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/33xxx/CVE-2026-33814.json">CVE-2026-33814</a>
      Referenceadded
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      https://access.redhat.com/errata/RHSA-2026:62550
      Referenceadded
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      https://access.redhat.com/errata/RHSA-2026:62551
      Referenceadded
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      https://access.redhat.com/errata/RHSA-2026:63050

      Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

    Show 21 older changes
    1. Record modifiedRed Hat ADP

      Show 13 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Affected versions (publisher)added
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      Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/33xxx/CVE-2026-33814.json">CVE-2026-33814</a>
      Referenceadded
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      https://access.redhat.com/errata/RHSA-2026:63046
      Referenceadded
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      https://access.redhat.com/errata/RHSA-2026:63047
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      https://access.redhat.com/errata/RHSA-2026:63048
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      https://access.redhat.com/errata/RHSA-2026:63091
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      https://access.redhat.com/errata/RHSA-2026:63096
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      https://access.redhat.com/errata/RHSA-2026:63097
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      https://access.redhat.com/errata/RHSA-2026:63103
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      https://access.redhat.com/errata/RHSA-2026:63104
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      https://access.redhat.com/errata/RHSA-2026:63636
      Referenceadded
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      https://access.redhat.com/errata/RHSA-2026:63637
      Referenceadded
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      https://access.redhat.com/errata/RHSA-2026:63639
      Referenceadded
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      https://access.redhat.com/errata/RHSA-2026:65126

      Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

    2. Record modifiedRed Hat ADP

      1 individual change: Affected versions (publisher)

      Show the original change
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Affected versions (publisher)added
      —
      Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/33xxx/CVE-2026-33814.json">CVE-2026-33814</a>

      Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

    3. Record modifiedRed Hat ADP

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      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:59833
      Referenceadded
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      https://access.redhat.com/errata/RHSA-2026:60025

      Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

    4. Record modifiedRed Hat ADP

      Show 6 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Affected versions (publisher)added
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      Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/33xxx/CVE-2026-33814.json">CVE-2026-33814</a>
      Referenceadded
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      https://access.redhat.com/errata/RHSA-2026:60441
      Referenceadded
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      https://access.redhat.com/errata/RHSA-2026:60442
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      https://access.redhat.com/errata/RHSA-2026:60477
      Referenceadded
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      https://access.redhat.com/errata/RHSA-2026:60478
      Referenceadded
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      https://access.redhat.com/errata/RHSA-2026:60668

      Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

    5. Record modifiedRed Hat ADP

      Show 2 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Affected versions (publisher)added
      —
      Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/33xxx/CVE-2026-33814.json">CVE-2026-33814</a>
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:61253

      Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

    6. Record modifiedRed Hat ADP

      Show 2 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Affected versions (publisher)added
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      Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/33xxx/CVE-2026-33814.json">CVE-2026-33814</a>
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:60520

      Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

    7. Record modifiedRed Hat ADP

      1 individual change: Affected versions (publisher)

      Show the original change
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Affected versions (publisher)changed
      Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0 (+1046)
      Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0 (+1046)

      Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

    8. Record modifiedRed Hat ADP

      1 individual change: Affected versions (publisher)

      Show the original change
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Affected versions (publisher)changed
      Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0 (+1046)
      Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0 (+1046)

      Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

    9. Record modifiedRed Hat ADP

      1 individual change: Affected versions (publisher)

      Show the original change
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Affected versions (publisher)changed
      Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0 (+1046)
      Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0 (+1046)

      Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

    10. Record modifiedRed Hat ADP

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      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:57191
      Referenceadded
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      https://access.redhat.com/errata/RHSA-2026:57194
      Affected versions (publisher)changed
      Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0 (+1045)
      Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0 (+1046)

      Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

    11. Record modifiedRed Hat ADP

      1 individual change: Affected versions (publisher)

      Show the original change
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Affected versions (publisher)changed
      Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0 (+1045)
      Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0 (+1045)

      Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

    12. Record modifiedRed Hat ADP

      1 individual change: Affected versions (publisher)

      Show the original change
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Affected versions (publisher)changed
      Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0 (+1045)
      Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0 (+1045)

      Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

    13. Record modifiedRed Hat ADP

      1 individual change: Affected versions (publisher)

      Show the original change
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Affected versions (publisher)changed
      Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0 (+1039)
      Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0 (+1045)

      Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

    14. Record modifiedRed Hat ADP

      1 individual change: Affected versions (publisher)

      Show the original change
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Affected versions (publisher)changed
      Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0 (+1039)
      Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0 (+1039)

      Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

    15. Record modifiedRed Hat ADP

      Show 2 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:50205
      Affected versions (publisher)changed
      Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0 (+1039)
      Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0 (+1039)

      Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

    16. Record modifiedRed Hat ADP

      1 individual change: Affected versions (publisher)

      Show the original change
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Affected versions (publisher)changed
      Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0 (+151)
      Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0 (+1039)

      Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

    17. Record modifiedRed Hat ADP

      1 individual change: Affected versions (publisher)

      Show the original change
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Affected versions (publisher)changed
      Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0 (+149)
      Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0 (+151)

      Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

    18. Record modifiedRed Hat ADP

      Show 2 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:43692
      Affected versions (publisher)changed
      Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0 (+149)
      Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0 (+149)

      Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

    19. Record modifiedRed Hat ADP

      Show 2 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:42644
      Affected versions (publisher)changed
      Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0 (+149)
      Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0 (+149)

      Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

    20. Record modifiedRed Hat ADP

      1 individual change: Affected versions (publisher)

      Show the original change
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Affected versions (publisher)changed
      Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0 (+149)
      Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0, Cluster Observability Operator 1.5.0 (+149)

      Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

    21. Record modifiedRed Hat ADP

      1 individual change: Affected versions (publisher)

      Show the original change
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Affected versions (publisher)changed
      Cluster Observability Operator 1.5.0, Red Hat Hardened Images, Red Hat OpenShift Service Mesh 3.0 (+10)
      Cluster Observability Operator 1.5.0, Red Hat Hardened Images, Red Hat OpenShift Service Mesh 3.0 (+11)

      Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

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