# CVE-2026-3833

> Vulnerability · severity: **MEDIUM** (CVSS 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.

## Key facts

- **CVE ID:** CVE-2026-3833
- **Published:** 2026-04-30
- **CVSS severity:** MEDIUM
- **CVSS base score:** 6.5
- **CWE codes:** CWE-178

## Affected products

- `gnu:gnutls`
- `redhat:hardened_images`
- `redhat:openshift_container_platform`
- `redhat:enterprise_linux`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-3833

## Citation

> AI Analytics. CVE-2026-3833. Retrieved 2026-07-15 from https://api.ai-analytics.org/cve/CVE-2026-3833. Derived from NIST NVD. Licensed CC0.

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