synced 9 MIN AGO
01 Record

CVE-2026-42013

Gnutls: gnutls: certificate validation bypass due to oversized subject alternative name

HighPUBLISHEDCNA: redhat
CNA base score8.2 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
View raw JSON

02 Description

Gnutls: gnutls: certificate validation bypass due to oversized subject alternative name

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
  • Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.42% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 36.2% of scored records. A rank, not a probability.
NVD base score
8.2 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
NVD analysis status
Awaiting Analysis. NVD last modified this record on 2026-10-29.
Red Hat severity
Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2026-05-26 21:29Z5 MO AGO
Last updated
2026-10-29 05:55Z6 HR AGO
Reserved
2026-04-23
Assigning CNA
redhat
Record state
PUBLISHED
Severity
High (CVSS 8.2)
CNA CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
Weaknesses
  • CWE-295Improper Certificate ValidationBase
Data version
5.2
Document digest
1d46e943e88a743050e3358efb14fd621dddd3e2efd93f757d6d15b3b2df4ec1

05 Affected products

VendorProductVersionsPlatforms
Red HatRed Hat Enterprise Linux 10Not specified—
Red HatRed Hat Enterprise Linux 10.0 Extended Update SupportNot specified—
Red HatRed Hat Enterprise Linux 7 Extended Lifecycle SupportNot specified—
Red HatRed Hat Enterprise Linux 8Not specified—
Red HatRed Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportNot specified—
Red HatRed Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-OnNot specified—
Red HatRed Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportNot specified—
Red HatRed Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-OnNot specified—
Red HatRed Hat Enterprise Linux 8.8 Telecommunications Update ServiceNot specified—
Red HatRed Hat Enterprise Linux 8.8 Update Services for SAP SolutionsNot specified—
Red HatRed Hat Enterprise Linux 9Not specified—
Red HatRed Hat Enterprise Linux 9.2 Update Services for SAP SolutionsNot specified—
Red HatRed Hat Enterprise Linux 9.4 Update Services for SAP SolutionsNot specified—
Red HatRed Hat Enterprise Linux 9.6 Extended Update SupportNot specified—
Red HatRed Hat OpenShift Container Platform 4.12Not specified—
Red HatRed Hat OpenShift Container Platform 4.16Not specified—
Red HatRed Hat OpenShift Container Platform 4.17Not specified—
Red HatRed Hat OpenShift Container Platform 4.18Not specified—
Red HatRed Hat OpenShift Container Platform 4.19Not specified—
Red HatRed Hat OpenShift Container Platform 4.20Not specified—
Red HatRed Hat OpenShift Container Platform 4.21Not specified—
Red HatRed Hat OpenShift Container Platform 4.22Not specified—
Red HatCert Manager support for Red Hat OpenShift release 1.17Not specified—
Red HatCert Manager support for Red Hat OpenShift release 1.18Not specified—
Red HatCert Manager support for Red Hat OpenShift release 1.20Not specified—
Red HatRed Hat Discovery 2Not specified—
Red HatRed Hat Hardened ImagesNot specified—
Red HatRed Hat OpenShift AI 3.4Not specified—
Red HatRed Hat Update Infrastructure 5Not specified—
Red HatRed Hat Enterprise Linux 6Not specified—
Red HatRed Hat OpenShift Container Platform 4Not specified—

06 References

07 Fixed in

AlmaLinux 8

  • gnutls
    Fixed in 3.6.16-8.el8_10.6
  • gnutls-c++
    Fixed in 3.6.16-8.el8_10.6
  • gnutls-dane
    Fixed in 3.6.16-8.el8_10.6
  • gnutls-devel
    Fixed in 3.6.16-8.el8_10.6
  • gnutls-utils
    Fixed in 3.6.16-8.el8_10.6

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

AlmaLinux 9

  • gnutls
    Fixed in 3.8.10-4.el9_8
  • gnutls-c++
    Fixed in 3.8.10-4.el9_8
  • gnutls-dane
    Fixed in 3.8.10-4.el9_8
  • gnutls-devel
    Fixed in 3.8.10-4.el9_8
  • gnutls-utils
    Fixed in 3.8.10-4.el9_8

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

AlmaLinux 10

  • gnutls
    Fixed in 3.8.10-4.el10_2
  • gnutls-c++
    Fixed in 3.8.10-4.el10_2
  • gnutls-dane
    Fixed in 3.8.10-4.el10_2
  • gnutls-devel
    Fixed in 3.8.10-4.el10_2
  • gnutls-fips
    Fixed in 3.8.10-4.el10_2
  • gnutls-utils
    Fixed in 3.8.10-4.el10_2

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 8

  • gnutls
    Fixed in 3.6.16-8.el8_10.6
  • gnutls-c++
    Fixed in 3.6.16-8.el8_10.6
  • gnutls-dane
    Fixed in 3.6.16-8.el8_10.6
  • gnutls-devel
    Fixed in 3.6.16-8.el8_10.6
  • gnutls-utils
    Fixed in 3.6.16-8.el8_10.6

Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 9

  • gnutls
    Fixed in 3.8.10-4.el9_8
  • gnutls-c++
    Fixed in 3.8.10-4.el9_8
  • gnutls-dane
    Fixed in 3.8.10-4.el9_8
  • gnutls-devel
    Fixed in 3.8.10-4.el9_8
  • gnutls-utils
    Fixed in 3.8.10-4.el9_8

Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 10

  • gnutls
    Fixed in 3.8.10-4.el10_2
  • gnutls-c++
    Fixed in 3.8.10-4.el10_2
  • gnutls-dane
    Fixed in 3.8.10-4.el10_2
  • gnutls-devel
    Fixed in 3.8.10-4.el10_2
  • gnutls-fips
    Fixed in 3.8.10-4.el10_2
  • gnutls-utils
    Fixed in 3.8.10-4.el10_2

Derived from AlmaLinux 10. Partial coverage: only packages taken from AlmaLinux 10 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

Debian 12

  • gnutls28
    Fixed in 3.7.9-2+deb12u7

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

  • gnutls28
    Fixed in 3.8.9-3+deb13u4

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

  • gnutls28
    Fixed in 3.8.13-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 22.04 LTS

  • gnutls28
    Fixed in 3.7.3-4ubuntu1.9

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 24.04 LTS

  • gnutls28
    Fixed in 3.8.3-1.1ubuntu3.6

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 25.10

  • gnutls28
    Fixed in 3.8.9-3ubuntu2.2

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 26.04 LTS

  • gnutls28
    Fixed in 3.8.12-2ubuntu1.1

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 16.04 LTS

  • gnutls28
    Fixed in 3.4.10-4ubuntu1.9+esm4
    Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 18.04 LTS

  • gnutls28
    Fixed in 3.5.18-1ubuntu1.6+esm4
    Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 20.04 LTS

  • gnutls28
    Fixed in 3.6.13-2ubuntu1.12+esm3
    Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro FIPS-preview 22.04 LTS

  • gnutls28
    No fix yet

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro FIPS-updates 22.04 LTS

  • gnutls28
    Fixed in 3.7.3-4ubuntu1.9+Fips1
    Available with Ubuntu Pro: https://ubuntu.com/pro

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro FIPS-updates 24.04 LTS

  • gnutls28
    Fixed in 3.8.3-1.1ubuntu3.6+Fips1.2
    Available with Ubuntu Pro: https://ubuntu.com/pro

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.