CVE-2026-3833

Discovered by AISLEPUBLISHEDCWE-178

Description

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.

CVSS Base Scores

CVSS v3.1(Primary)
6.5

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Affected Products

VendorProductVersionStatus
Red HatGnuTLS0affected
Red HatGnuTLS0:3.8.10-4.el10_2unaffected
Red HatGnuTLS0:3.6.16-8.el8_10.6—
Red HatGnuTLS0:3.8.10-4.el9_8—
Red HatGnuTLS3.8.13-1.hum1—

References