CVE-2026-42012Gnutls: gnutls: certificate validation bypass due to improper handling of uri and srv sans
Updated under an hour ago ()
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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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A flaw was found in gnutls. A remote attacker could exploit this vulnerability by presenting a specially crafted certificate that contains Uniform Resource Identifier (URI) or Service (SRV) Subject Alternative Names (SANs). This could cause the certificate validation process to incorrectly fall back to checking DNS hostnames against the Common Name (CN), potentially allowing the attacker to spoof legitimate services or intercept sensitive information.
- CVSS
- 7.1 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/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 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 |
Red Hat Red Hat OpenShift Container Platform 4 redhat:openshift | 4 | 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-2026:41921vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:43575vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:58981vendor-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
- https://access.redhat.com/errata/RHSA-2026:82354vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:82372vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:82857vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:82888vendor-advisory, x-refsource-redhat
- https://access.redhat.com/security/cve/CVE-2026-42012vdb-entry, 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.