LowCVE-2026-3832

    Gnutls: Incorrect Behavior Order: Early Validation (CVE-2026-3832)

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

    What is affected, what to do

    A flaw was found in gnutls. A remote attacker could exploit this vulnerability by presenting a specially crafted Online Certificate Status Protocol (OCSP) response during a TLS handshake.

    An exploit is publicly available. Update Gnutls to version 3.8.13, Red Hat Enterprise Linux 10 to version 0:3.8.10-4.el10_2, Red Hat Enterprise Linux 10.0 Extended Update Support to version 0:3.8.9-9.el10_0.19.

    Affected
    • Gnutls lt *..3.8.13
    • Red Hat Enterprise Linux 10 lt *..0:3.8.10-4.el10_2
    • Red Hat Enterprise Linux 10.0 Extended Update Support lt *..0:3.8.9-9.el10_0.19
    • Red Hat Enterprise Linux 9 lt *..0:3.8.10-4.el9_8
    • Red Hat Cert Manager support for Red Hat OpenShift release 1.17 lt *..1791371080
    • Red Hat Cert Manager support for Red Hat OpenShift release 1.17 lt *..1791371069
    • Red Hat Cert Manager support for Red Hat OpenShift release 1.17 lt *..1791788287
    • Red Hat Cert Manager support for Red Hat OpenShift release 1.17 lt *..1791970484
    • Red Hat Cert Manager support for Red Hat OpenShift release 1.18 lt *..1791459707
    • Red Hat Cert Manager support for Red Hat OpenShift release 1.18 lt *..1791459711
    • Red Hat Cert Manager support for Red Hat OpenShift release 1.18 lt *..1791459759
    • Red Hat Cert Manager support for Red Hat OpenShift release 1.18 lt *..1789029076
    • Red Hat Cert Manager support for Red Hat OpenShift release 1.18 lt *..1791966259
    • Red Hat Cert Manager support for Red Hat OpenShift release 1.20 lt *..1790598593
    • Red Hat Discovery 2 lt *..1782159791
    • Red Hat Discovery 2 lt *..1782166952
    • Red Hat Hardened Images lt *..3.8.13-1.hum1
    • Red Hat Update Infrastructure 5 lt *..1781525684
    • Red Hat Update Infrastructure 5 lt *..1781525671
    • Red Hat Update Infrastructure 5 lt *..1781525693
    • Red Hat Update Infrastructure 5 lt *..1781525739
    • Red Hat Update Infrastructure 5 lt *..1787241211
    • Red Hat Update Infrastructure 5 lt *..1787135742
    • Red Hat Update Infrastructure 5 lt *..1787241260
    Fixed in
    • Gnutls 3.8.13
    • Red Hat Enterprise Linux 10 0:3.8.10-4.el10_2
    • Red Hat Enterprise Linux 10.0 Extended Update Support 0:3.8.9-9.el10_0.19
    • Red Hat Enterprise Linux 9 0:3.8.10-4.el9_8
    • Red Hat Cert Manager support for Red Hat OpenShift release 1.17 1791371080
    • Red Hat Cert Manager support for Red Hat OpenShift release 1.17 1791371069
    • Red Hat Cert Manager support for Red Hat OpenShift release 1.17 1791788287
    • Red Hat Cert Manager support for Red Hat OpenShift release 1.17 1791970484
    • Red Hat Cert Manager support for Red Hat OpenShift release 1.18 1791459707
    • Red Hat Cert Manager support for Red Hat OpenShift release 1.18 1791459711
    • Red Hat Cert Manager support for Red Hat OpenShift release 1.18 1791459759
    • Red Hat Cert Manager support for Red Hat OpenShift release 1.18 1789029076
    • Red Hat Cert Manager support for Red Hat OpenShift release 1.18 1791966259
    • Red Hat Cert Manager support for Red Hat OpenShift release 1.20 1790598593
    • Red Hat Discovery 2 1782159791
    • Red Hat Discovery 2 1782166952
    • Red Hat Hardened Images 3.8.13-1.hum1
    • Red Hat Update Infrastructure 5 1781525684
    • Red Hat Update Infrastructure 5 1781525671
    • Red Hat Update Infrastructure 5 1781525693
    • Red Hat Update Infrastructure 5 1781525739
    • Red Hat Update Infrastructure 5 1787241211
    • Red Hat Update Infrastructure 5 1787135742
    • Red Hat Update Infrastructure 5 1787241260

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    Metrics

    3.7

    Priority

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

    Source: NVD, CVSS v3

    3.7

    CVSS v3

    Severity Low on the scale from 0 to 10.

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

    0.8 %

    EPSS score

    Low — model estimates < 1% exploitation likelihood.

    Source: FIRST EPSS, percentile 56.5

    Show all metrics
    Severity
    Low
    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
    60.97 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
    PoC (publicly reported)
    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
    3.7 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
    3.7
    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
    0.8 %
    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
    56.5
    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-179

    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
    Handle the vulnerability in regular vulnerability handling under Art. 21(2)(e) NIS2.
    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 gnutls. A remote attacker could exploit this vulnerability by presenting a specially crafted Online Certificate Status Protocol (OCSP) response during a TLS handshake. Due to a logic error in how gnutls processes multi-record OCSP responses, a client with OCSP verification enabled may incorrectly accept a revoked server certificate, potentially leading to a compromise of trust.

    Source: redhat_csaf, suse_csaf, Ubuntu Security Notices, BSI WID Portal, BSI CSAF, NVD (NIST), cvelistv5, Microsoft Security Update Guide, 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
    —gnutls
    • < 3.8.13
    • 3.8.13
    Red HatCert Manager support for Red Hat OpenShift release 1.17
    • < 1791970484
    • < 1791371080
    • < 1791371069
    • < 1791788287
    • 1791970484
    • 1791371080
    • 1791371069
    • 1791788287
    Red HatCert Manager support for Red Hat OpenShift release 1.18
    • < 1791459711
    • < 1791966259
    • < 1791459707
    • < 1789029076
    • < 1791459759
    • 1791459711
    • 1791966259
    • 1791459707
    • 1789029076
    • 1791459759
    Red HatCert Manager support for Red Hat OpenShift release 1.20
    • < 1790598593
    • 1790598593
    Red HatRed Hat Discovery 2
    • < 1782159791
    • < 1782166952
    • 1782159791
    • 1782166952
    Red HatRed Hat Enterprise Linux 10
    • < 0:3.8.10-4.el10_2
    • 0:3.8.10-4.el10_2
    Red HatRed Hat Enterprise Linux 10.0 Extended Update Support
    • < 0:3.8.9-9.el10_0.19
    • 0:3.8.9-9.el10_0.19
    Red HatRed Hat Enterprise Linux 6
    • —
    • —
    Red HatRed Hat Enterprise Linux 7
    • —
    • —
    Red HatRed Hat Enterprise Linux 8
    • —
    • —
    Red HatRed Hat Enterprise Linux 9
    • < 0:3.8.10-4.el9_8
    • 0:3.8.10-4.el9_8
    Red HatRed Hat Hardened Images
    • < 3.8.13-1.hum1
    • 3.8.13-1.hum1
    Red HatRed Hat OpenShift Container Platform 4
    • —
    • —
    Red HatRed Hat Update Infrastructure 5
    • < 1787241260
    • < 1787135742
    • < 1787241211
    • < 1781525693
    • < 1781525671
    • < 1781525739
    • < 1781525684
    • 1787241260
    • 1787135742
    • 1787241211
    • 1781525693
    • 1781525671
    • 1781525739
    • 1781525684
    gnugnutls
    • —
    • —
    redhathardened_images
    • —
    • —
    redhatopenshift_container_platform
    • 4.0
    • —
    IBMDataPower Gateway
    • < 11.0.0.3
    • < 10.6.0.11
    • < 10.5.0.23
    • 11.0.0.3
    • 10.6.0.11
    • 10.5.0.23

    Vendors and products

    Affected operating systems

    Affected operating systems
    Linuxredhatenterprise_linux10.0
    Linuxredhatenterprise_linux6.0
    Linuxredhatenterprise_linux7.0
    Linuxredhatenterprise_linux8.0
    Linuxredhatenterprise_linux9.0

    Weakness classes (CWE)

    • CWE-179Incorrect Behavior Order: Early Validation

      Base

      The product validates input before applying protection mechanisms that modify the input, which could allow an attacker to bypass the validation via dangerous inputs that only arise after the modification.

      Entry at MITRE CWE-179

    Public exploit references

    Publicly reported proof-of-concepts, exploit modules and detection templates for this vulnerability. NEOSEC links to the original sources only and does not provide any exploit code.

    Public exploit references
    Reference tagged as exploitgitlab.com (opens in a new tab)PoC (publicly reported)reported, not verified—

    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

      Show 3 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/2026/3xxx/CVE-2026-3832.json">CVE-2026-3832</a>
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:82857
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:82888

      Source identifier: secalert@redhat.com

    2. Record modifiedRed Hat

      Show 6 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/2026/3xxx/CVE-2026-3832.json">CVE-2026-3832</a>
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:82304
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:82322
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:82347
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:82354
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:82372

      Source identifier: secalert@redhat.com

    3. Record modifiedRed Hat

      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/2026/3xxx/CVE-2026-3832.json">CVE-2026-3832</a>
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:72502

      Source identifier: secalert@redhat.com

    4. Record modifiedRed Hat

      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/2026/3xxx/CVE-2026-3832.json">CVE-2026-3832</a>

      Source identifier: secalert@redhat.com

    5. Record modifiedRed Hat

      Show 25 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/2026/3xxx/CVE-2026-3832.json">CVE-2026-3832</a>
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:13274
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:20612
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:20613
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:26319
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:26409
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:29197
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:58981
      Referenceadded
      —
      https://access.redhat.com/security/cve/CVE-2026-3832
      Referenceadded
      —
      https://bugzilla.redhat.com/show_bug.cgi?id=2445762
      Referenceadded
      —
      https://gitlab.com/gnutls/gnutls/-/issues/1801
      Referenceremoved
      https://access.redhat.com/errata/RHSA-2026:13274
      —
      Referenceremoved
      https://access.redhat.com/errata/RHSA-2026:20612
      —
      Referenceremoved
      https://access.redhat.com/errata/RHSA-2026:20613
      —
      Referenceremoved
      https://access.redhat.com/errata/RHSA-2026:26319
      —
      Referenceremoved
      https://access.redhat.com/errata/RHSA-2026:26409
      —
      Referenceremoved
      https://access.redhat.com/errata/RHSA-2026:29197
      —
      Referenceremoved
      https://access.redhat.com/errata/RHSA-2026:58981
      —
      Referenceremoved
      https://access.redhat.com/security/cve/CVE-2026-3832
      —
      Referenceremoved
      https://bugzilla.redhat.com/show_bug.cgi?id=2445762
      —
      Referenceremoved
      https://gitlab.com/gnutls/gnutls/-/issues/1801
      —
      Reference typeremoved
      https://access.redhat.com/errata/RHSA-2026:13274 Types: Third Party Advisory
      —
      Reference typeremoved
      https://access.redhat.com/security/cve/CVE-2026-3832 Types: Third Party Advisory
      —
      Reference typeremoved
      https://bugzilla.redhat.com/show_bug.cgi?id=2445762 Types: Issue Tracking, Third Party Advisory
      —
      Reference typeremoved
      https://gitlab.com/gnutls/gnutls/-/issues/1801 Types: Exploit, Issue Tracking, Vendor Advisory
      —

      Source identifier: secalert@redhat.com

    Show 3 older changes

    1. Record modifiedCISA ADP

      Show 3 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Referenceadded
      —
      https://gitlab.com/gnutls/gnutls/-/issues/1801
      Referenceremoved
      https://gitlab.com/gnutls/gnutls/-/issues/1801
      —
      Reference typeremoved
      https://gitlab.com/gnutls/gnutls/-/issues/1801 Types: Exploit, Issue Tracking, Vendor Advisory
      —

      Source identifier: 134c704f-9b21-4f2e-91b3-4a467353bcc0

    2. Record modifiedRed Hat

      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 10.0 Extended Update Support (+14)
      …, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support (+14)

      Source identifier: secalert@redhat.com

    3. Record modifiedRed Hat

      Show 2 original changes
      Individual changes of this event as published by NVD
      TypeActionBeforeAfter
      Referenceadded
      —
      https://access.redhat.com/errata/RHSA-2026:29197
      Affected versions (publisher)changed
      …, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support (+11)
      …, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support (+13)

      Source identifier: secalert@redhat.com

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