CVE-2026-42012
7.1
HIGH
CVSS 3.1
EPSS 0.04%
Description
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.
How to fix CVE-2026-42012
To remediate CVE-2026-42012, upgrade the affected package to a fixed version below.
- —upgrade to 3.8.13-r0 or later
- —upgrade to 3.7.1-5+deb11u10 or later
Is CVE-2026-42012 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 3.8.13-r0
- from 0, < 3.7.1-5+deb11u10
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N |