Medium severity6.5NVD Advisory· Published Apr 30, 2026· Updated Jun 2, 2026
CVE-2026-3833
CVE-2026-3833
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
16- cpe:2.3:a:redhat:hardened_images:-:*:*:*:*:*:*:*
- cpe:2.3:a:redhat:openshift_container_platform:4.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:*+ 4 more
- cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*
- osv-coords6 versionspkg:rpm/almalinux/gnutlspkg:rpm/almalinux/gnutls-c%2B%2Bpkg:rpm/almalinux/gnutls-danepkg:rpm/almalinux/gnutls-develpkg:rpm/almalinux/gnutls-utilspkg:rpm/opensuse/gnutls&distro=openSUSE%20Tumbleweed
< 3.6.16-8.el8_10.6+ 5 more
- (no CPE)range: < 3.6.16-8.el8_10.6
- (no CPE)range: < 3.6.16-8.el8_10.6
- (no CPE)range: < 3.6.16-8.el8_10.6
- (no CPE)range: < 3.6.16-8.el8_10.6
- (no CPE)range: < 3.6.16-8.el8_10.6
- (no CPE)range: < 3.8.13-1.1
Patches
Vulnerability mechanics
References
7- gitlab.com/gnutls/gnutls/-/issues/1803nvdExploitIssue TrackingVendor Advisory
- access.redhat.com/errata/RHSA-2026:13274nvdIssue TrackingThird Party Advisory
- access.redhat.com/security/cve/CVE-2026-3833nvdThird Party Advisory
- bugzilla.redhat.com/show_bug.cginvdIssue TrackingThird Party Advisory
- access.redhat.com/errata/RHSA-2026:20611nvd
- access.redhat.com/errata/RHSA-2026:20612nvd
- access.redhat.com/errata/RHSA-2026:20613nvd
News mentions
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