HighCVE-2026-35469

    SpdyStream: DOS on CRI (CVE-2026-35469)

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

    What is affected, what to do

    spdystream is a Go library for multiplexing streams over SPDY connections. In versions 0.5.0 and below, the SPDY/3 frame parser does not validate attacker-controlled counts and lengths before allocating memory.

    Update Moby Spdystream to version 0.5.1.

    Affected
    • Moby Spdystream lt *..0.5.1
    Fixed in
    • Moby Spdystream 0.5.1

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

    Metrics

    8.7

    Priority

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

    Source: NVD, CVSS v4

    6.5

    CVSS v3

    Severity Medium on the scale from 0 to 10.

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

    0.7 %

    EPSS score

    Low — model estimates < 1% exploitation likelihood.

    Source: FIRST EPSS, percentile 51.2

    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
    80.83 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
    8.7 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
    6.5
    CVSS v4

    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
    8.7
    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
    0.7 %
    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
    51.2
    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
    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-770, CWE-770

    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

    spdystream is a Go library for multiplexing streams over SPDY connections. In versions 0.5.0 and below, the SPDY/3 frame parser does not validate attacker-controlled counts and lengths before allocating memory. Three allocation paths are affected: the SETTINGS frame entry count, the header count in parseHeaderValueBlock, and individual header field sizes — all read as 32-bit integers and used directly as allocation sizes with no bounds checking. Because SPDY header blocks are zlib-compressed, a small on-the-wire payload can decompress into large attacker-controlled values. A remote peer that can send SPDY frames to a service using spdystream can exhaust process memory and cause an out-of-memory crash with a single crafted control frame. This issue has been fixed in version 0.5.1.

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

    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
    mobyspdystream
    • < 0.5.1
    • 0.5.1
    IBMConcert
    • < 3.0.0
    • 3.0.0
    Red HatOpenShift Container Platform
    • < 4.22
    • 4.22
    gogithub.com/moby/spdystream
    • —
    • —

    Vendors and products

    Weakness classes (CWE)

    • CWE-770Allocation of Resources Without Limits or Throttling

      Base

      The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.

      Entry at MITRE CWE-770
    • CWE-770Allocation of Resources Without Limits or Throttling

      Base

      The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.

      Entry at MITRE CWE-770

    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

      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/2026/35xxx/CVE-2026-35469.json">CVE-2026-35469</a>
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:66521

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

    2. 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/2026/35xxx/CVE-2026-35469.json">CVE-2026-35469</a>
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:63046

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

    3. 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/2026/35xxx/CVE-2026-35469.json">CVE-2026-35469</a>

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

    4. 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/2026/35xxx/CVE-2026-35469.json">CVE-2026-35469</a>

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

    5. Record modifiedRed Hat ADP

      Show the original change
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:61314

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

    Show 21 older changes
    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)changed
      Red Hat OpenShift Container Platform 4.19, Red Hat OpenShift Container Platform 4.19, RHEM 1.0 for RHEL 9 (+261)
      cert-manager Operator for Red Hat OpenShift, Dynamic Accelerator Slicer Operator for Red Hat OpenShift, Logging Subsystem for Red Hat OpenShift (+46)

      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)changed
      Red Hat OpenShift Container Platform 4.19, Red Hat OpenShift Container Platform 4.19, RHEM 1.0 for RHEL 9 (+261)
      Red Hat OpenShift Container Platform 4.19, Red Hat OpenShift Container Platform 4.19, RHEM 1.0 for RHEL 9 (+261)

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

    3. 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
      Red Hat OpenShift Container Platform 4.19, Red Hat OpenShift Container Platform 4.19, RHEM 1.0 for RHEL 9 (+241)
      Red Hat OpenShift Container Platform 4.19, Red Hat OpenShift Container Platform 4.19, RHEM 1.0 for RHEL 9 (+261)

      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
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:56431
      Affected versions (publisher)changed
      Red Hat OpenShift Container Platform 4.19, Red Hat OpenShift Container Platform 4.19, RHEM 1.0 for RHEL 9 (+241)
      Red Hat OpenShift Container Platform 4.19, Red Hat OpenShift Container Platform 4.19, RHEM 1.0 for RHEL 9 (+241)

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

    5. 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
      Red Hat OpenShift Container Platform 4.19, Red Hat OpenShift Container Platform 4.19, RHEM 1.0 for RHEL 9 (+241)
      Red Hat OpenShift Container Platform 4.19, Red Hat OpenShift Container Platform 4.19, RHEM 1.0 for RHEL 9 (+241)

      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
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:51022
      Affected versions (publisher)changed
      Red Hat OpenShift Container Platform 4.19, RHEM 1.0 for RHEL 9, RHEM 1.1 for RHEL 10 (+235)
      Red Hat OpenShift Container Platform 4.19, RHEM 1.0 for RHEL 9, RHEM 1.1 for RHEL 10 (+235)

      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
      Red Hat OpenShift Container Platform 4.19, RHEM 1.0 for RHEL 9, RHEM 1.1 for RHEL 10 (+235)
      Red Hat OpenShift Container Platform 4.19, RHEM 1.0 for RHEL 9, RHEM 1.1 for RHEL 10 (+235)

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

    8. Record modifiedRed Hat ADP

      Show 3 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:47728
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:47729
      Affected versions (publisher)changed
      Red Hat OpenShift Container Platform 4.19, RHEM 1.0 for RHEL 9, RHEM 1.1 for RHEL 10 (+233)
      Red Hat OpenShift Container Platform 4.19, RHEM 1.0 for RHEL 9, RHEM 1.1 for RHEL 10 (+235)

      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
      Red Hat OpenShift Container Platform 4.19, RHEM 1.0 for RHEL 9, RHEM 1.1 for RHEL 10 (+233)
      Red Hat OpenShift Container Platform 4.19, RHEM 1.0 for RHEL 9, RHEM 1.1 for RHEL 10 (+233)

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

    10. 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
      Red Hat OpenShift Container Platform 4.19, RHEM 1.0 for RHEL 9, RHEM 1.1 for RHEL 10 (+233)
      Red Hat OpenShift Container Platform 4.19, RHEM 1.0 for RHEL 9, RHEM 1.1 for RHEL 10 (+233)

      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
      Red Hat OpenShift Container Platform 4.19, RHEM 1.0 for RHEL 9, RHEM 1.1 for RHEL 10 (+233)
      Red Hat OpenShift Container Platform 4.19, RHEM 1.0 for RHEL 9, RHEM 1.1 for RHEL 10 (+233)

      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
      Red Hat OpenShift Container Platform 4.19, RHEM 1.0 for RHEL 9, RHEM 1.1 for RHEL 10 (+233)
      Red Hat OpenShift Container Platform 4.19, RHEM 1.0 for RHEL 9, RHEM 1.1 for RHEL 10 (+233)

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

    13. Record modifiedRed Hat ADP

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      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
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      —
      https://access.redhat.com/errata/RHSA-2026:43227
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:43253
      Affected versions (publisher)changed
      Red Hat OpenShift Container Platform 4.19, RHEM 1.0 for RHEL 9, RHEM 1.1 for RHEL 10 (+231)
      Red Hat OpenShift Container Platform 4.19, RHEM 1.0 for RHEL 9, RHEM 1.1 for RHEL 10 (+233)

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

    14. 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-2026:44267
      Affected versions (publisher)changed
      Red Hat OpenShift Container Platform 4.19, RHEM 1.0 for RHEL 9, RHEM 1.1 for RHEL 10 (+230)
      Red Hat OpenShift Container Platform 4.19, RHEM 1.0 for RHEL 9, RHEM 1.1 for RHEL 10 (+230)

      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-2026:40030
      Affected versions (publisher)changed
      Red Hat OpenShift Container Platform 4.19, RHEM 1.0 for RHEL 9, RHEM 1.1 for RHEL 10 (+229)
      Red Hat OpenShift Container Platform 4.19, RHEM 1.0 for RHEL 9, RHEM 1.1 for RHEL 10 (+230)

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

    16. Record modifiedRed Hat ADP

      Show 3 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:40022
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:40023
      Affected versions (publisher)changed
      Red Hat OpenShift Container Platform 4.19, RHEM 1.0 for RHEL 9, RHEM 1.1 for RHEL 10 (+228)
      Red Hat OpenShift Container Platform 4.19, RHEM 1.0 for RHEL 9, RHEM 1.1 for RHEL 10 (+229)

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

    17. 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-2026:40828
      Affected versions (publisher)changed
      Red Hat OpenShift Container Platform 4.19, RHEM 1.0 for RHEL 9, RHEM 1.1 for RHEL 10 (+227)
      Red Hat OpenShift Container Platform 4.19, RHEM 1.0 for RHEL 9, RHEM 1.1 for RHEL 10 (+228)

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

    18. 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
      Red Hat OpenShift Container Platform 4.19, RHEM 1.0 for RHEL 9, RHEM 1.1 for RHEL 10 (+227)
      Red Hat OpenShift Container Platform 4.19, RHEM 1.0 for RHEL 9, RHEM 1.1 for RHEL 10 (+227)

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

    19. 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
      Red Hat OpenShift Container Platform 4.19, RHEM 1.0 for RHEL 9, RHEM 1.1 for RHEL 10 (+227)
      Red Hat OpenShift Container Platform 4.19, RHEM 1.0 for RHEL 9, RHEM 1.1 for RHEL 10 (+227)

      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
      Red Hat OpenShift Container Platform 4.19, RHEM 1.0 for RHEL 9, RHEM 1.1 for RHEL 10 (+227)
      Red Hat OpenShift Container Platform 4.19, RHEM 1.0 for RHEL 9, RHEM 1.1 for RHEL 10 (+227)

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

    21. 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-2026:34050
      Referenceadded
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      https://access.redhat.com/errata/RHSA-2026:34099
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:34766
      Referenceadded
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      https://access.redhat.com/errata/RHSA-2026:36796
      Affected versions (publisher)changed
      Red Hat Advanced Cluster Management for Kubernetes 2.13, Red Hat Advanced Cluster Security for Kubernetes 4.10, Red Hat Advanced Cluster Security for Kubernetes 4.8 (+37)
      RHEM 1.0 for RHEL 9, Red Hat Advanced Cluster Management for Kubernetes 2.13, Red Hat Advanced Cluster Security for Kubernetes 4.10 (+37)

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

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