🛡️ USN-8539-1 — gnutls28 (CVE-2026-42011 +4 more)

gnutls28 vulnerabilities

Haruto Kimura discovered that GnuTLS did not properly apply permitted

name constraints in certain certificate validation paths. A remote

attacker could possibly use this issue to bypass certificate validation,

leading to a machine-in-the-middle attack. (CVE-2026-42011)

Oleh Konko discovered that GnuTLS incorrectly fell back to Common Name

checks for certain URI and SRV subject alternative names. A remote

attacker could possibly use this issue to bypass certificate validation,

leading to a machine-in-the-middle attack. (CVE-2026-42012)

Haruto Kimura and Joshua Rogers discovered that GnuTLS incorrectly fell

back to Common Name checks when subject alternative names were

oversized. A remote attacker could possibly use this issue to bypass

certificate validation, leading to a machine-in-the-middle attack.

(CVE-2026-42013)

Luigino Camastra and Joshua Rogers discovered that GnuTLS had a

use-after-free issue when changing PKCS#11 token security officer PINs

in certain cases. An attacker could possibly use this issue to cause

GnuTLS to crash, resulting in a denial of service, or execute arbitrary

code. (CVE-2026-42014)

Zou Dikai discovered that GnuTLS did not properly validate PKCS#12 bag

sizes in certain cases. An attacker could possibly use this issue to

cause GnuTLS to crash, resulting in a denial of service, or execute

arbitrary code. (CVE-2026-42015)