Fluid Attacks Database

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.

Mitigation

Update Impact

Minimal update. May introduce new vulnerabilities or breaking changes.

Ecosystem	Component	Affected version	Patched versions
debian 11	gnutls28	=3.7.1-5 \|\| =3.7.1-5+deb11u1 \|\| =3.7.1-5+deb11u2 \|\| =3.7.1-5+deb11u3 \|\| =3.7.1-5+deb11u4 \|\| =3.7.1-5+deb11u5 \|\| =3.7.1-5+deb11u6 \|\| =3.7.1-5+deb11u7 \|\| =3.7.1-5+deb11u8 \|\| =3.7.1-5+deb11u9 \|\| >=0 <3.7.1-5+deb11u10	3.7.1-5+deb11u10
debian 12	gnutls28	=3.7.9-2 \|\| =3.7.9-2+deb12u1 \|\| =3.7.9-2+deb12u2 \|\| =3.7.9-2+deb12u3 \|\| =3.7.9-2+deb12u4 \|\| =3.7.9-2+deb12u5 \|\| =3.7.9-2+deb12u6 \|\| >=0 <3.7.9-2+deb12u7	3.7.9-2+deb12u7
debian 13	gnutls28	=3.8.9-3 \|\| =3.8.9-3+deb13u1 \|\| =3.8.9-3+deb13u2 \|\| =3.8.9-3+deb13u3 \|\| >=0 <3.8.9-3+deb13u4	3.8.9-3+deb13u4
debian 14	gnutls28	=3.8.10-1 \|\| =3.8.10-2 \|\| =3.8.10-3 \|\| =3.8.11-1 \|\| =3.8.11-2 \|\| =3.8.11-3 \|\| =3.8.12-1 \|\| =3.8.12-2 \|\| =3.8.12-3 \|\| =3.8.12-4 \|\| =3.8.9-3 \|\| >=0 <3.8.13-1	3.8.13-1
alpine v3.20	gnutls	>=0 <3.8.13-r0	3.8.13-r0
alpine v3.21	gnutls	>=0 <3.8.13-r0	3.8.13-r0
alpine v3.22	gnutls	>=0 <3.8.13-r0	3.8.13-r0
alpine v3.23	gnutls	>=0 <3.8.13-r0	3.8.13-r0
rpm rhel10	gnutls	<0:3.8.10-4.el10_2	0:3.8.10-4.el10_2
rpm rhel6	gnutls	-	-

1-10 of 20

Aliases

1. CVE-2026-420122. NVD-2026-420123. OSV-DEBIAN-2026-420124. OSV-2026-420125. OSV-ALPINE-2026-420126. SECURITY-TRACKER-CVE-2026-420127. SECURITY-CVE-2026-42012

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