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8.2 High

CVE-2026-42013 Gnutls: gnutls: certificate validation bypass due to oversized subject alternative name

Description

A flaw was found in gnutls. When validating certificates, an oversized Subject Alternative Name (SAN) could cause the validation process to incorrectly fall back to checking the Common Name (CN) field. This could allow a remote attacker to bypass proper certificate validation, potentially leading to spoofing or man-in-the-middle attacks.

CVSS 3.1 detail

Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N

Exploitable remotely over the network, without an account and without any user action; an attacker can seriously compromise confidentiality, integrity or availability.

Attack vector
Network
Attack complexity
Low
Privileges required
None
Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
High
Availability
None

Affected products and versions

Product Affected versions Fixed in
Red Hat Enterprise Linux 10 Versions not published
Red Hat Enterprise Linux 6 Versions not published
Red Hat Enterprise Linux 7 Versions not published
Red Hat Enterprise Linux 8 Versions not published
Red Hat Enterprise Linux 9 Versions not published
Red Hat Hardened Images 3.8 earliest → < 3.8.13-1.hum1 3.8.13-1.hum1
Red Hat OpenShift Container Platform 4 Versions not published
Red Hat Enterprise Linux 10.0 Extended Update Support Versions not published
Red Hat Update Infrastructure 5 1787241260 earliest → < 1787241260 1787241260
Show the 24 other branches
Product Affected versions Fixed in
Red Hat Discovery 2 1782166952 earliest → < 1782166952 1782166952
Red Hat Enterprise Linux 9.6 Extended Update Support Versions not published
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support Versions not published
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On Versions not published
Red Hat Enterprise Linux 8.8 Telecommunications Update Service Versions not published
Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions Versions not published
Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions Versions not published
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support Versions not published
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On Versions not published
Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Versions not published
Red Hat Enterprise Linux 7 Extended Lifecycle Support Versions not published
Red Hat OpenShift Container Platform 4.19 4.19 earliest → < 4.19.9.6.202607151909-0 4.19.9.6.202607151909-0
Red Hat OpenShift Container Platform 4.18 418.94 earliest → < 418.94.202608142238-0 418.94.202608142238-0
Red Hat OpenShift Container Platform 4.16 416.94 earliest → < 416.94.202608150307-0 416.94.202608150307-0
Red Hat OpenShift Container Platform 4.12 412.86 earliest → < 412.86.202608241157-0 412.86.202608241157-0
Red Hat OpenShift Container Platform 4.17 417.94 earliest → < 417.94.202608250221-0 417.94.202608250221-0
Cert Manager support for Red Hat OpenShift release 1.20 1790598593 earliest → < 1790598593 1790598593
Red Hat OpenShift AI 3.4 1790703542 earliest → < 1790703542 1790703542
Cert Manager support for Red Hat OpenShift release 1.17 1791970484 earliest → < 1791970484 1791970484
Cert Manager support for Red Hat OpenShift release 1.18 1791966259 earliest → < 1791966259 1791966259
Red Hat OpenShift Container Platform 4.20 4.20 earliest → < 4.20.9.6.202610242033-0 4.20.9.6.202610242033-0
Red Hat OpenShift Container Platform 4.21 4.21 earliest → < 4.21.9.6.202610241345-0 4.21.9.6.202610241345-0
Red Hat OpenShift Container Platform 4.22 4.22 earliest → < 4.22.9.8.202610241758-0 4.22.9.8.202610241758-0
Red Hat OpenShift Container Platform 5 Versions not published

References

Timeline

  1. Published
  2. Last modified

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