Improper Authentication in GnuTLS - CVE-2026-42010
Published: April 30, 2026
Vulnerability identifier: #VU128571
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-42010
CWE-ID: CWE-287
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: GnuTLS
Affected software:
GnuTLS
GnuTLS
Detailed vulnerability description
The vulnerability allows a remote attacker to bypass authentication.
The vulnerability exists due to improper authentication in RSA-PSK username matching when processing usernames containing a NUL character. A remote attacker can supply a specially crafted username to bypass authentication.
How to mitigate CVE-2026-42010
Install security update from vendor's website.