CVE-2026-42010
CRITICAL9.8EPSS 0.11%Published: 5/7/2026Modified: 5/22/2026
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.
Affected packages (2)
- Alpine/gnutlsfrom 0, < 3.8.13-r0
- Debian/gnutls28from 0, < 3.7.1-5+deb11u10
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | CRITICAL9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |