by Kastro CVE-2026-42010
Red Hat Red Hat Enterprise Linux 10 — Gnutls: gnutls: authentication bypass via nul character in username
Description · from the CVE record
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
ProductAffectedFixed inSource
gnutls3.6.13 – < 3.8.133.8.13CNA
Red Hat Enterprise Linux 10see advisory0:3.8.10-4.el10_2CNA
Red Hat Enterprise Linux 10.0 Extended Update Supportsee advisory0:3.8.9-9.el10_0.19CNA
Red Hat Enterprise Linux 8see advisory0:3.6.16-8.el8_10.6CNA
Red Hat Enterprise Linux 8see advisory0:3.6.16-8.el8_10.6CNA
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Supportsee advisory0:3.6.14-10.el8_4.1CNA
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Supportsee advisory0:4.13-3.el8_4.1CNA
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-Onsee advisory0:3.6.14-10.el8_4.1CNA
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-Onsee advisory0:4.13-3.el8_4.1CNA
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Supportsee advisory0:3.6.16-5.el8_6.5CNA
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Supportsee advisory0:4.13-3.el8_6.2CNA
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-Onsee advisory0:3.6.16-5.el8_6.5CNA
Scores by source
NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
redhat (CNA)7.1CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
redhat-SADP (CNA)7.1CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: partial