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.
History

Thu, 07 May 2026 14:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-626
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 07 May 2026 12:15:00 +0000

Type Values Removed Values Added
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.
Title Gnutls: gnutls: authentication bypass via nul character in username
First Time appeared Redhat
Redhat enterprise Linux
Redhat hummingbird
Redhat openshift
CPEs cpe:/a:redhat:hummingbird:1
cpe:/a:redhat:openshift:4
cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:6
cpe:/o:redhat:enterprise_linux:7
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat enterprise Linux
Redhat hummingbird
Redhat openshift
References
Metrics cvssV3_1

{'score': 7.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-05-07T13:47:17.179Z

Reserved: 2026-04-23T11:23:46.517Z

Link: CVE-2026-42010

cve-icon Vulnrichment

Updated: 2026-05-07T13:46:44.564Z

cve-icon NVD

Status : Received

Published: 2026-05-07T12:16:17.977

Modified: 2026-05-07T12:16:17.977

Link: CVE-2026-42010

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.