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CVE-2026-3833

MEDIUM

6.5

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.

CVE Details

CVSS v3.1 Score6.5

SeverityMEDIUM

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

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published4/30/2026

Last Modified5/3/2026

Sourcenvd

Honeypot Sightings0

Weaknesses (CWE)

CWE-178

References

https://access.redhat.com/errata/RHSA-2026:13274(secalert@redhat.com)

https://access.redhat.com/security/cve/CVE-2026-3833(secalert@redhat.com)

https://bugzilla.redhat.com/show_bug.cgi?id=2445763(secalert@redhat.com)

https://gitlab.com/gnutls/gnutls/-/issues/1803(secalert@redhat.com)

https://gitlab.com/gnutls/gnutls/-/issues/1803(134c704f-9b21-4f2e-91b3-4a467353bcc0)

IOC Correlations

No correlations recorded

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