HighCVE-2026-39829

    Invoking pathological RSA/DSA parameters may cause DoS in golang.org/x/crypto/ssh (CVE-2026-39829)

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

    What is affected, what to do

    A flaw was found in golang.org/x/crypto/ssh. The RSA and DSA public key parsers in the affected component did not enforce size limits on key parameters.

    Update Golang.org/x/crypto/ssh to version 0.52.0.

    Affected
    • Golang.org/x/crypto/ssh lt *..0.52.0
    Fixed in
    • Golang.org/x/crypto/ssh 0.52.0

    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, BSI, Msrc Update Guide, CVE.org, OSV, EUVD

    0.5 %

    EPSS score

    Low — model estimates < 1% exploitation likelihood.

    Source: FIRST EPSS, percentile 40.2

    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
    68.25 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
    0.5 %
    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
    40.2
    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

    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 golang.org/x/crypto/ssh. The RSA and DSA public key parsers in the affected component did not enforce size limits on key parameters. This vulnerability allows an unauthenticated client to provide a crafted public key with an excessively large modulus or DSA parameter during public key authentication. Successful exploitation could lead to a denial of service (DoS) due to prolonged CPU consumption during signature verification.

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

    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
    golang.org/x/cryptogolang.org/x/crypto/ssh
    • < 0.52.0
    • 0.52.0
    golangcrypto
    • < 0.52.0
    • 0.52.0
    GolangGo crypto module
    • < 0.52.0
    • 0.52.0

    Vendors and products

    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)

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      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/2026/39xxx/CVE-2026-39829.json">CVE-2026-39829</a>

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

    2. 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-2026:67450

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

    3. Record modifiedRed Hat ADP

      Show 2 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/2026/39xxx/CVE-2026-39829.json">CVE-2026-39829</a>
      Referenceadded
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      https://access.redhat.com/errata/RHSA-2026:66022

      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/2026/39xxx/CVE-2026-39829.json">CVE-2026-39829</a>
      Referenceadded
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      https://access.redhat.com/errata/RHSA-2026:65964

      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
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      Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/39xxx/CVE-2026-39829.json">CVE-2026-39829</a>
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:65126

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

    Show 24 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)added
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      Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/39xxx/CVE-2026-39829.json">CVE-2026-39829</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
      —
      Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/39xxx/CVE-2026-39829.json">CVE-2026-39829</a>

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

    3. 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/2026/39xxx/CVE-2026-39829.json">CVE-2026-39829</a>
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:60477

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

    4. Record modifiedRed Hat ADP

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

      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
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      Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/39xxx/CVE-2026-39829.json">CVE-2026-39829</a>
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:60520

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

    6. 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
      Cryostat 4 on RHEL 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10 (+298)
      Assisted Installer for Red Hat OpenShift Container Platform 2, cert-manager Operator for Red Hat OpenShift, Confidential Compute Attestation (+71)

      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
      Cryostat 4 on RHEL 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10 (+298)
      Cryostat 4 on RHEL 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10 (+298)

      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
      Cryostat 4 on RHEL 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10 (+296)
      Cryostat 4 on RHEL 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10 (+298)

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

    9. 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-2026:57191
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:57194
      Affected versions (publisher)changed
      Cryostat 4 on RHEL 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10 (+288)
      Cryostat 4 on RHEL 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10 (+296)

      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
      Cryostat 4 on RHEL 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10 (+288)
      Cryostat 4 on RHEL 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10 (+288)

      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
      Cryostat 4 on RHEL 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10 (+288)
      Cryostat 4 on RHEL 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10 (+288)

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

    12. 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-2026:52857
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:52910
      Affected versions (publisher)changed
      Cryostat 4 on RHEL 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10 (+288)
      Cryostat 4 on RHEL 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10 (+288)

      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
      Cryostat 4 on RHEL 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10 (+288)
      Cryostat 4 on RHEL 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10 (+288)

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

    14. 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-2026:51033
      Affected versions (publisher)changed
      Cryostat 4 on RHEL 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10 (+287)
      Cryostat 4 on RHEL 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10 (+288)

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

    15. 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-2026:48693
      Affected versions (publisher)changed
      Cryostat 4 on RHEL 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10 (+287)
      Cryostat 4 on RHEL 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10 (+287)

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

    16. 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-2026:49944
      Affected versions (publisher)changed
      Cryostat 4 on RHEL 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10 (+285)
      Cryostat 4 on RHEL 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10 (+287)

      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
      Cryostat 4 on RHEL 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10 (+285)
      Cryostat 4 on RHEL 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10 (+285)

      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
      Cryostat 4 on RHEL 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10 (+285)
      Cryostat 4 on RHEL 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10 (+285)

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

    19. 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-2026:47949
      Referenceadded
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      https://access.redhat.com/errata/RHSA-2026:48151
      Affected versions (publisher)changed
      Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8 (+284)
      Cryostat 4 on RHEL 9, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10 (+285)

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

    20. 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-2026:46885
      Referenceadded
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      https://access.redhat.com/errata/RHSA-2026:46903
      Affected versions (publisher)changed
      Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8 (+281)
      Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8 (+282)

      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
      Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8 (+281)
      Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8 (+281)

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

    22. Record modifiedRed Hat ADP

      Show 3 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
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      —
      https://access.redhat.com/errata/RHSA-2026:43052
      Referenceadded
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      https://access.redhat.com/errata/RHSA-2026:43692
      Affected versions (publisher)changed
      Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8 (+281)
      Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8 (+281)

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

    23. 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-2026:42796
      Affected versions (publisher)changed
      Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8 (+280)
      Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8 (+281)

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

    24. 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-2026:42146
      Affected versions (publisher)changed
      Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8 (+279)
      Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8 (+280)

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

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