CVE-2026-42011Gnutls: gnutls: security bypass due to incorrect name constraint handling
Updated under an hour ago ()
Does this affect you?
It affects Red Hat Enterprise Linux 10 and 13 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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Free account, 1 product
A flaw was found in gnutls. This vulnerability occurs because permitted name constraints were incorrectly ignored when previous Certificate Authorities (CAs) only had excluded name constraints. A remote attacker could exploit this to bypass critical name constraint checks during certificate validation. This bypass could lead to the acceptance of invalid certificates, potentially enabling spoofing or man-in-the-middle attacks against affected systems.
- CVSS
- 7.4 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
- Weakness (CWE)
- CWE-295
- 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
- Awaiting Analysis
- 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 |
References
- https://access.redhat.com/errata/RHSA-2026:13274vendor-advisory, x-refsource-redhat
- 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-2026:40762vendor-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-2026:56853vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:57483vendor-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-2026:72502vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:74674vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:82304vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:82322vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:82347vendor-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.