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Vulnerabilities CVE-2026-42010

CVE-2026-42010

High
Open
TLP:CLEAR

Gnutls: gnutls: authentication bypass via nul character in username

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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.

Details

CVSS Score
7.1
EPSS Score
1.05%

61.4th percentile

CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
Confidence
90%
Published
May 7, 2026
Last Modified
Aug 21, 2026
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