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CVE-2026-42011

33
FAUCET Score

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.

First published: May 7, 2026Last modified: Jul 22, 2026

Impacted Technologies

VendorProductVersion(s)CPE
Red HatRed Hat Enterprise Linux 8
Range not provided by sourceCNA affecteddefault affected
Red HatRed Hat Enterprise Linux 9
Range not provided by sourceCNA affecteddefault affected
Red HatRed Hat OpenShift Container Platform 4
Range not provided by sourceCNA affecteddefault unknown
Red HatRed Hat OpenShift Container Platform 4.19
Range not provided by sourceCNA affecteddefault affected
Red HatRed Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
Range not provided by sourceCNA affecteddefault affected

CVSS Data

CVSS version used by this source: 3.1

7.4HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
2.2
Impact Score
5.2
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.47%
Probability of exploitation in next 30 days
EPSS Percentile
38.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0047 is in the 12th percentile among its peer group of 8,920 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (7)

ubuntupatch availablevia ubuntu_usn
Product: gnutls28 (jammy)Fixed in: 3.7.3-4ubuntu1.9
ubuntupatch availablevia ubuntu_usn
Product: gnutls28 (noble)Fixed in: 3.8.3-1.1ubuntu3.6
ubuntupatch availablevia ubuntu_usn
Product: gnutls28 (questing)Fixed in: 3.8.9-3ubuntu2.2
ubuntupatch availablevia ubuntu_usn
Product: gnutls28 (resolute)Fixed in: 3.8.12-2ubuntu1.1
ubuntupatch availablevia ubuntu_usn
Product: gnutls28 (bionic)Fixed in: 3.5.18-1ubuntu1.6+esm4
ubuntupatch availablevia ubuntu_usn
Product: gnutls28 (focal)Fixed in: 3.6.13-2ubuntu1.12+esm3
ubuntupatch availablevia ubuntu_usn
Product: gnutls28 (xenial)Fixed in: 3.4.10-4ubuntu1.9+esm4

Vendor Advisories (3)

ubuntuUSN-8539-1

GnuTLS vulnerabilities

Jul 14, 2026
ubuntuUSN-8284-1

GnuTLS vulnerabilities

May 20, 2026
microsoft2026-May/CVE-2026-42011Moderate

Gnutls: gnutls: security bypass due to incorrect name constraint handling

May 12, 2026

References

access.redhat.com / errata/RHSA-2026:13274
access.redhat.com / errata/RHSA-2026:20611
access.redhat.com / errata/RHSA-2026:20612
access.redhat.com / errata/RHSA-2026:20613
access.redhat.com / errata/RHSA-2026:26319
access.redhat.com / errata/RHSA-2026:26409
access.redhat.com / errata/RHSA-2026:29197
access.redhat.com / errata/RHSA-2026:30004
access.redhat.com / errata/RHSA-2026:30849
access.redhat.com / errata/RHSA-2026:30850
access.redhat.com / errata/RHSA-2026:32962
access.redhat.com / errata/RHSA-2026:33125
access.redhat.com / errata/RHSA-2026:40762
access.redhat.com / errata/RHSA-2026:41921
access.redhat.com / errata/RHSA-2026:43575
access.redhat.com / security/cve/CVE-2026-42011
bugzilla.redhat.com / show_bug.cgi
gnutls.org / security-new.html