CVE Watch13 jul 2026

CVE-2026-3833

A flaw was found in gnutls. This vulnerability occurs because gnutls performs case-sensitive comparisons of `nameConstraints` labels, specif

CVSS

6.5

Medio

EPSS

0.6%

p43

KEV

—

Exploit Today

0-100

Publicado: 30 abr 2026 · Última mod.: 13 jul 2026 · CWE-178

EPSS · 30d

0.6%EPSS · 30 días0.6%

2026-06-302026-07-16

Descripción técnica

A flaw was found in gnutls. This vulnerability occurs because gnutls performs case-sensitive comparisons of `nameConstraints` labels, specifically for `dNSName` (DNS) or `rfc822Name` (email) constraints within `excludedSubtrees` or `permittedSubtrees`. A remote attacker can exploit this by crafting a leaf certificate with casing differences in the Subject Alternative Name (SAN), leading to a policy bypass where a certificate that should be rejected is instead accepted. This could result in unauthorized access or information disclosure.

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