CVE-2026-42012
A flaw was found in gnutls. A remote attacker could exploit this vulnerability by presenting a specially crafted certificate that contains Uniform Resource Identifier (URI) or Service (SRV) Subject Alternative Names (SANs). This could cause the certificate validation process to incorrectly fall back to checking DNS hostnames against the Common Name (CN), potentially allowing the attacker to spoof legitimate services or intercept sensitive information.
Scoring
- Severity
- HIGH
- CVSS base score
- 7.1
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N
- EPSS probability
- 0.35%
- CWE
- CWE-295
- Published
- 2026-05-26
- Last modified
- 2026-09-14
Affected products
- Red Hat Red Hat Enterprise Linux 8
- Red Hat Red Hat Enterprise Linux 10
- Red Hat Red Hat Enterprise Linux 9
- Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support
- Red Hat Red Hat Update Infrastructure 5
- Red Hat Red Hat Update Infrastructure 5
- Red Hat Red Hat Update Infrastructure 5
- Red Hat Red Hat Update Infrastructure 5