CVE-2026-3833Gnutls: gnutls: policy bypass due to case-sensitive nameconstraints comparison
Updated under an hour ago ()
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It affects Red Hat Enterprise Linux 10 and 16 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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
- 6.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
- Weakness (CWE)
- CWE-178
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- redhat
- NVD analysis
- Modified
- Record last updated
- Oct 14, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux | from 0:3.8.10-4.el10_2 not affected | CNA record |
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support redhat:enterprise_linux_eus | from 0:3.8.9-9.el10_0.19 not affected | CNA record |
from 0:3.3.29-9.el7_9.2 not affected | CNA record | |
from 0:3.6.14-10.el8_4.1 not affected | CNA record | |
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support redhat:rhel_eus_long_life | from 0:3.6.14-10.el8_4.1 not affected | CNA record |
from 0:3.6.16-7.el8_8.4 not affected | CNA record | |
from 0:3.6.16-7.el8_8.4 not affected | CNA record | |
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support redhat:rhel_eus | from 0:3.8.3-6.el9_6.4 not affected | CNA record |
Red Hat Red Hat OpenShift Container Platform 4.12 redhat:openshift | from 412.86.202608241157-0 not affected | CNA record |
Red Hat Cert Manager support for Red Hat OpenShift release 1.17 redhat:cert_manager | from 1791371080 not affected | CNA record |
Red Hat Red Hat Discovery 2 redhat:discovery | from 1782159791 not affected | CNA record |
Red Hat Red Hat Hardened Images redhat:hummingbird | from 3.8.13-1.hum1 not affected | CNA record |
Red Hat Red Hat OpenShift AI 3.4 redhat:openshift_ai | from 1790703542 not affected | CNA record |
Red Hat Red Hat Update Infrastructure 5 redhat:rhui | from 1781525684 not affected | CNA record |
gnu gnutls gnu:gnutls | all versions | NVD |
redhat hardened_images redhat:hardened_images | all versions | NVD |
redhat openshift_container_platform redhat:openshift_container_platform | 4.0 | NVD |
redhat enterprise_linux redhat:enterprise_linux | 6.0; 7.0; 8.0; 9.0; 10.0 | NVD |
References
- https://access.redhat.com/errata/RHSA-2026:13274vendor-advisory, x-refsource-redhat, issue-tracking, third-party-advisory
- https://access.redhat.com/errata/RHSA-2026:20611vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:20612vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:20613vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:26319vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:26409vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:29197vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:30004vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:30849vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:30850vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:32962vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:33125vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:41921vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:43575vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:57402vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:58981vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:59831vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:60019vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:62409vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:62549vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:65839vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:65851vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:67857vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:72502vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:74674vendor-advisory, x-refsource-redhat
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.