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CVE-2026-42011

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

Published: May 7, 2026Updated: Jun 17, 2026 Sources: CVE List NVDCWE-295
NVD MITRE
7.4CVSSHIGH
EPSS Score
0.4%
Top 69.8%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

Description

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 Vector Breakdown

AV:NAC:HPR:NUI:NS:UC:HI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-295

Affected Products

Red Hat Enterprise Linux 10Red Hat
On-premOS
Operating Systems / linux-distro
Red Hat Enterprise Linux 10.0 Extended Update SupportRed Hat
On-premOS
Operating Systems / linux-distro
Red Hat Enterprise Linux 8Red Hat
On-premOS
Operating Systems / linux-distro
Red Hat Enterprise Linux 9Red Hat
On-premOS
Operating Systems / linux-distro
Red Hat Hardened ImagesRed Hat
On-premOS
Operating Systems / linux-distro
red hatcommercialUSOperating Systemsaka red hat
and 4 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

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Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

MITRE ATT&CK

1 technique
Collection
View detailed technique mapping

References

https://access.redhat.com/errata/RHSA-2026:13274
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:20611
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:20612
access.redhat.com
and 5 more references View all →

Timeline

Published
May 7, 2026
Last Updated
Jun 17, 2026

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