CVE-2026-42010 — Gnutls: gnutls: authentication bypass via nul character in username
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 usern…
Published: 2026-05-07 · CVSS: 7.1 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7