Description
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.
CVSS breakdown
CVSS 3.1
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
Low
Availability
None
Affected products
- gnu / gnutls
- RedHat / enterprise_linux10.0 – 10.0
- RedHat / enterprise_linux8.0 – 8.0
- RedHat / enterprise_linux9.0 – 9.0
- RedHat / enterprise_linux6.0 – 6.0
- RedHat / enterprise_linux7.0 – 7.0
- RedHat / hardened_images
- RedHat / openshift_container_platform4.0 – 4.0
References
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:13274
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:20611
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:20612
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:20613
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:26319
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:26409
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:29197
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:30004
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:30849
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:30850
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:32962
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:33125
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:34764
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:34788
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:34790
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:36004
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:36005
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:36006
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:40762
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:41921
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:57483
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:58981
- VENDOR_ADVISORYhttps://access.redhat.com/security/cve/CVE-2026-42010
- MISChttps://bugzilla.redhat.com/show_bug.cgi?id=2467289
- MISChttps://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-4
Updated 8m ago · 8 sources