CVE-2026-42012: Gnutls: gnutls: certificate validation bypass due to improper handling of uri and srv sans

Gnutls: gnutls: certificate validation bypass due to improper handling of uri and srv sans

F-GNUTLS-HOSTNAME-001

Public snapshot: 26 Sep 2026. Status, releases and attribution belong to each source below; none is inferred from another record.

Recorded evidence

—score not recorded

CVE-2026-42012CVEgnutls/gnutls

Gnutls: gnutls: certificate validation bypass due to improper handling of uri and srv sans

Fixed in: GnuTLS 3.8.13

patched

details

Finding IDs: F-GNUTLS-HOSTNAME-001
CVE: CVE-2026-42012
Status: patched
Fixed in: GnuTLS 3.8.13
Recorded credit: reported by Oleh Konko (1seal)
Note: x509/hostname-verify: make URI/SRV SAN preclude CN fallback
CVE registry state: PUBLISHED
CVE state checked: 23 Sep 2026

F-GNUTLS-HOSTNAME-001: Verification failures. URI or SRV SAN entries incorrectly permit common-name fallback. Reviewed 24 Sep 2026. Mechanism assessed by 1seal.

Mechanism source for F-GNUTLS-HOSTNAME-001

Security area (1seal assessment): Identity. URI or SRV SAN entries incorrectly permit common-name fallback. Reviewed 24 Sep 2026.

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How this page groups evidence

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