Bug 2467448 (CVE-2026-42013) - CVE-2026-42013 gnutls: gnutls: Certificate validation bypass due to oversized Subject Alternative Name
Summary: CVE-2026-42013 gnutls: gnutls: Certificate validation bypass due to oversized...
Keywords:
Status: NEW
Alias: CVE-2026-42013
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-05-06 19:48 UTC by OSIDB Bzimport
Modified: 2026-06-29 15:07 UTC (History)
6 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:26409 0 None None None 2026-06-16 16:39:29 UTC
Red Hat Product Errata RHSA-2026:30004 0 None None None 2026-06-25 18:07:39 UTC
Red Hat Product Errata RHSA-2026:30849 0 None None None 2026-06-29 02:48:35 UTC
Red Hat Product Errata RHSA-2026:30850 0 None None None 2026-06-29 02:30:19 UTC
Red Hat Product Errata RHSA-2026:32962 0 None None None 2026-06-29 09:47:20 UTC
Red Hat Product Errata RHSA-2026:33125 0 None None None 2026-06-29 15:07:33 UTC

Description OSIDB Bzimport 2026-05-06 19:48:36 UTC 
libgnutls: Suppress CN fallback for oversized SAN
   Validation of certificates with oversized Subject Alternative Names no longer falls back to checking DNS hostnames against Common Name.
Comment 3 errata-xmlrpc 2026-06-16 16:39:28 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:26409 https://access.redhat.com/errata/RHSA-2026:26409
Comment 5 errata-xmlrpc 2026-06-25 18:07:38 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:30004 https://access.redhat.com/errata/RHSA-2026:30004
Comment 6 errata-xmlrpc 2026-06-29 02:30:18 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Via RHSA-2026:30850 https://access.redhat.com/errata/RHSA-2026:30850
Comment 7 errata-xmlrpc 2026-06-29 02:48:34 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On

Via RHSA-2026:30849 https://access.redhat.com/errata/RHSA-2026:30849
Comment 8 errata-xmlrpc 2026-06-29 09:47:19 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Via RHSA-2026:32962 https://access.redhat.com/errata/RHSA-2026:32962
Comment 9 errata-xmlrpc 2026-06-29 15:07:32 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

Via RHSA-2026:33125 https://access.redhat.com/errata/RHSA-2026:33125
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