Bug 2467289 (CVE-2026-42010) - CVE-2026-42010 gnutls: gnutls: Authentication Bypass via NUL Character in Username
Summary: CVE-2026-42010 gnutls: gnutls: Authentication Bypass via NUL Character in Use...
Keywords:
Status: NEW
Alias: CVE-2026-42010
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-05-06 17:08 UTC by OSIDB Bzimport
Modified: 2026-06-16 16:39 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 RHBA-2026:20910 0 None None None 2026-05-26 12:26:57 UTC
Red Hat Product Errata RHBA-2026:20937 0 None None None 2026-05-26 15:25:13 UTC
Red Hat Product Errata RHSA-2026:20611 0 None None None 2026-05-26 06:15:31 UTC
Red Hat Product Errata RHSA-2026:20612 0 None None None 2026-05-26 06:20:07 UTC
Red Hat Product Errata RHSA-2026:20613 0 None None None 2026-05-26 06:18:01 UTC
Red Hat Product Errata RHSA-2026:26409 0 None None None 2026-06-16 16:39:25 UTC

Description OSIDB Bzimport 2026-05-06 17:08:33 UTC 
libgnutls: 
   Servers configured with RSA-PSK have wrongfully matched usernames with NUL
   character in them to ones truncated to NUL character,
   which could lead to an authentication bypass.
   Fix the check to perform comparison up to the full username length.
   Reported by Joshua Rogers of AISLE Research Team.
   [GNUTLS-SA-2026-04-29-4, CVSS: high] [CVE-2026-42010]
Comment 2 errata-xmlrpc 2026-05-26 06:15:30 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:20611 https://access.redhat.com/errata/RHSA-2026:20611
Comment 3 errata-xmlrpc 2026-05-26 06:18:00 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:20613 https://access.redhat.com/errata/RHSA-2026:20613
Comment 4 errata-xmlrpc 2026-05-26 06:20:05 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:20612 https://access.redhat.com/errata/RHSA-2026:20612
Comment 10 errata-xmlrpc 2026-06-16 16:39:24 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
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