CVE-2026-42010

A flaw was found in gnutls. Servers configured with RSA-PSK (Rivest–Shamir–Adleman – Pre-Shared Key) wrongfully matched usernames containing a NUL character with truncated usernames. A remote attacker could exploit this by sending a specially crafted username, leading to an authentication bypass. This vulnerability allows an attacker to gain unauthorized access by circumventing the authentication process.
References
Link Resource
https://access.redhat.com/errata/RHSA-2026:13274
https://access.redhat.com/errata/RHSA-2026:20611
https://access.redhat.com/errata/RHSA-2026:20612
https://access.redhat.com/errata/RHSA-2026:20613
https://access.redhat.com/errata/RHSA-2026:26319
https://access.redhat.com/errata/RHSA-2026:26409
https://access.redhat.com/errata/RHSA-2026:29197
https://access.redhat.com/errata/RHSA-2026:30004
https://access.redhat.com/errata/RHSA-2026:30849
https://access.redhat.com/errata/RHSA-2026:30850
https://access.redhat.com/errata/RHSA-2026:32962
https://access.redhat.com/errata/RHSA-2026:33125
https://access.redhat.com/errata/RHSA-2026:34764
https://access.redhat.com/errata/RHSA-2026:34788
https://access.redhat.com/errata/RHSA-2026:34790
https://access.redhat.com/errata/RHSA-2026:36004
https://access.redhat.com/errata/RHSA-2026:36005
https://access.redhat.com/errata/RHSA-2026:36006
https://access.redhat.com/errata/RHSA-2026:40762
https://access.redhat.com/errata/RHSA-2026:41921
https://access.redhat.com/errata/RHSA-2026:56853
https://access.redhat.com/errata/RHSA-2026:57483
https://access.redhat.com/errata/RHSA-2026:58981
https://access.redhat.com/errata/RHSA-2026:59831
https://access.redhat.com/errata/RHSA-2026:60019
https://access.redhat.com/errata/RHSA-2026:62409
https://access.redhat.com/security/cve/CVE-2026-42010 Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2467289 Issue Tracking Vendor Advisory
https://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-4
https://access.redhat.com/errata/RHSA-2026:13274
https://access.redhat.com/errata/RHSA-2026:20611
https://access.redhat.com/errata/RHSA-2026:20612
https://access.redhat.com/errata/RHSA-2026:20613
https://access.redhat.com/errata/RHSA-2026:26319
https://access.redhat.com/errata/RHSA-2026:26409
https://access.redhat.com/errata/RHSA-2026:29197
https://access.redhat.com/errata/RHSA-2026:30004
https://access.redhat.com/errata/RHSA-2026:30849
https://access.redhat.com/errata/RHSA-2026:30850
https://access.redhat.com/errata/RHSA-2026:32962
https://access.redhat.com/errata/RHSA-2026:33125
https://access.redhat.com/errata/RHSA-2026:34764
https://access.redhat.com/errata/RHSA-2026:34788
https://access.redhat.com/errata/RHSA-2026:34790
https://access.redhat.com/errata/RHSA-2026:36004
https://access.redhat.com/errata/RHSA-2026:36005
https://access.redhat.com/errata/RHSA-2026:36006
https://access.redhat.com/errata/RHSA-2026:40762
https://access.redhat.com/errata/RHSA-2026:41921
https://access.redhat.com/errata/RHSA-2026:56853
https://access.redhat.com/errata/RHSA-2026:57483
https://access.redhat.com/errata/RHSA-2026:58981
https://access.redhat.com/errata/RHSA-2026:59831
https://access.redhat.com/errata/RHSA-2026:60019
https://access.redhat.com/errata/RHSA-2026:62409
https://access.redhat.com/security/cve/CVE-2026-42010 Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2467289 Issue Tracking Vendor Advisory
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42010.json
Configurations

Configuration 1 (hide)

OR cpe:2.3:a:gnu:gnutls:-:*:*:*:*:*:*:*
cpe:2.3:a:redhat:hardened_images:-:*:*:*:*:*:*:*
cpe:2.3:a:redhat:openshift_container_platform:4.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-05-07 12:16

Updated : 2026-09-15 12:17


NVD link : CVE-2026-42010

Mitre link : CVE-2026-42010

CVE.ORG link : CVE-2026-42010


JSON object : View

Products Affected

redhat

  • enterprise_linux
  • openshift_container_platform
  • hardened_images

gnu

  • gnutls
CWE
CWE-170

Improper Null Termination

CWE-626

Null Byte Interaction Error (Poison Null Byte)