Riskcovery

CVE-2026-42012

Gnutls: gnutls: certificate validation bypass due to improper handling of uri and srv sans

State
Published
Severity
7.1 High
Published
May 26, 2026
Updated
Oct 30, 2026
Reserved
Apr 23, 2026

Read the record on cve.org

Description

A flaw was found in gnutls. A remote attacker could exploit this vulnerability by presenting a specially crafted certificate that contains Uniform Resource Identifier (URI) or Service (SRV) Subject Alternative Names (SANs). This could cause the certificate validation process to incorrectly fall back to checking DNS hostnames against the Common Name (CN), potentially allowing the attacker to spoof legitimate services or intercept sensitive information.

Scores

CVSSScoreVectorSource
3.17.1 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:Nredhat

Weaknesses

  • CWE-295 Improper Certificate Validation

Affected Products

ProductVersions
gnutls
  • 0Affected
Red Hat Enterprise Linux 10Red Hat
  • 0:3.8.10-4.el10_2 and laterNot affected
Red Hat Enterprise Linux 10.0 Extended Update SupportRed Hat
  • 0:3.8.9-9.el10_0.19 and laterNot affected
Red Hat Enterprise Linux 7 Extended Lifecycle SupportRed Hat
  • 0:3.3.29-9.el7_9.2 and laterNot affected
Red Hat Enterprise Linux 8Red Hat
  • 0:3.6.16-8.el8_10.6 and laterNot affected
Red Hat Enterprise Linux 8Red Hat
  • 0:3.6.16-8.el8_10.6 and laterNot affected
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportRed Hat
  • 0:3.6.14-10.el8_4.1 and laterNot affected
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportRed Hat
  • 0:4.13-3.el8_4.1 and laterNot affected
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-OnRed Hat
  • 0:3.6.14-10.el8_4.1 and laterNot affected
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-OnRed Hat
  • 0:4.13-3.el8_4.1 and laterNot affected
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportRed Hat
  • 0:3.6.16-5.el8_6.5 and laterNot affected
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportRed Hat
  • 0:4.13-3.el8_6.2 and laterNot affected
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-OnRed Hat
  • 0:3.6.16-5.el8_6.5 and laterNot affected
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-OnRed Hat
  • 0:4.13-3.el8_6.2 and laterNot affected
Red Hat Enterprise Linux 8.8 Telecommunications Update ServiceRed Hat
  • 0:3.6.16-7.el8_8.4 and laterNot affected
Red Hat Enterprise Linux 8.8 Telecommunications Update ServiceRed Hat
  • 0:4.13-4.el8_8.1 and laterNot affected
Red Hat Enterprise Linux 8.8 Update Services for SAP SolutionsRed Hat
  • 0:3.6.16-7.el8_8.4 and laterNot affected
Red Hat Enterprise Linux 8.8 Update Services for SAP SolutionsRed Hat
  • 0:4.13-4.el8_8.1 and laterNot affected
Red Hat Enterprise Linux 9Red Hat
  • 0:3.8.10-4.el9_8 and laterNot affected
Red Hat Enterprise Linux 9Red Hat
  • 0:3.8.10-4.el9_8 and laterNot affected
Red Hat Enterprise Linux 9.2 Update Services for SAP SolutionsRed Hat
  • 0:3.7.6-21.el9_2.7 and laterNot affected
Red Hat Enterprise Linux 9.4 Update Services for SAP SolutionsRed Hat
  • 0:3.8.3-4.el9_4.6 and laterNot affected
Red Hat Enterprise Linux 9.6 Extended Update SupportRed Hat
  • 0:3.8.3-6.el9_6.4 and laterNot affected
Red Hat OpenShift Container Platform 4.20Red Hat
  • 4.20.9.6.202610242033-0 and laterNot affected
Red Hat OpenShift Container Platform 4.21Red Hat
  • 4.21.9.6.202610241345-0 and laterNot affected
Red Hat OpenShift Container Platform 4.22Red Hat
  • 4.22.9.8.202610241758-0 and laterNot affected
Cert Manager support for Red Hat OpenShift release 1.17Red Hat
  • 1791371080 and laterNot affected
Cert Manager support for Red Hat OpenShift release 1.17Red Hat
  • 1791371069 and laterNot affected
Cert Manager support for Red Hat OpenShift release 1.17Red Hat
  • 1791788287 and laterNot affected
Cert Manager support for Red Hat OpenShift release 1.17Red Hat
  • 1791970484 and laterNot affected
Cert Manager support for Red Hat OpenShift release 1.18Red Hat
  • 1791459707 and laterNot affected
Cert Manager support for Red Hat OpenShift release 1.18Red Hat
  • 1791459711 and laterNot affected
Cert Manager support for Red Hat OpenShift release 1.18Red Hat
  • 1791459759 and laterNot affected
Cert Manager support for Red Hat OpenShift release 1.18Red Hat
  • 1789029076 and laterNot affected
Cert Manager support for Red Hat OpenShift release 1.18Red Hat
  • 1791966259 and laterNot affected
Cert Manager support for Red Hat OpenShift release 1.20Red Hat
  • 1790598593 and laterNot affected
Red Hat Discovery 2Red Hat
  • 1782159791 and laterNot affected
Red Hat Discovery 2Red Hat
  • 1782166952 and laterNot affected
Red Hat Hardened ImagesRed Hat
  • 3.8.13-1.hum1 and laterNot affected
Red Hat OpenShift AI 3.4Red Hat
  • 1790703542 and laterNot affected
Red Hat Update Infrastructure 5Red Hat
  • 1781525684 and laterNot affected
Red Hat Update Infrastructure 5Red Hat
  • 1781525671 and laterNot affected
Red Hat Update Infrastructure 5Red Hat
  • 1781525693 and laterNot affected
Red Hat Update Infrastructure 5Red Hat
  • 1781525739 and laterNot affected
Red Hat Update Infrastructure 5Red Hat
  • 1787241211 and laterNot affected
Red Hat Update Infrastructure 5Red Hat
  • 1787135742 and laterNot affected
Red Hat Update Infrastructure 5Red Hat
  • 1787241260 and laterNot affected
Red Hat Enterprise Linux 6Red Hat
    Red Hat OpenShift Container Platform 4Red Hat
      Red Hat OpenShift Container Platform 4Red Hat
        Red Hat OpenShift Container Platform 5Red Hat

          References

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