CVE-2026-42010

CVE-2026-42010 · Gnutls: gnutls: authentication bypass via nul character in username

This page contains facts from public vulnerability sources. Check the original advisory before updating.

This page shows selected source facts. See the linked advisories for the complete description and affected versions.

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 7.1 · High · EPSS 1.1% · Fix available

Published

2026-05-07T12:00:05.433Z

Updated

2026-10-14T19:10:13.196Z

Stack: system

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