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

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Summary

CVECVE-2026-42011
StatePUBLISHED
Assignerredhat
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-07 15:16:09 UTC
Updated2026-06-30 03:19:30 UTC
DescriptionA 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.

Risk And Classification

Primary CVSS: v3.1 7.4 HIGH from [email protected]

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

EPSS: 0.004750000 probability, percentile 0.376470000 (date 2026-07-03)

Problem Types: CWE-295 | CWE-295 Improper Certificate Validation

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.4HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
3.1CNACVSS7.4HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Red Hat Red Hat Enterprise Linux 10 unaffected 0:3.8.10-4.el10_2 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support unaffected 0:3.8.9-9.el10_0.19 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8 unaffected 0:3.6.16-8.el8_10.6 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8 unaffected 0:3.6.16-8.el8_10.6 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support unaffected 0:3.6.14-10.el8_4.1 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support unaffected 0:4.13-3.el8_4.1 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On unaffected 0:3.6.14-10.el8_4.1 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On unaffected 0:4.13-3.el8_4.1 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support unaffected 0:3.6.16-5.el8_6.5 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support unaffected 0:4.13-3.el8_6.2 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On unaffected 0:3.6.16-5.el8_6.5 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On unaffected 0:4.13-3.el8_6.2 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service unaffected 0:3.6.16-7.el8_8.4 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service unaffected 0:4.13-4.el8_8.1 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.8 Update Services For SAP Solutions unaffected 0:3.6.16-7.el8_8.4 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.8 Update Services For SAP Solutions unaffected 0:4.13-4.el8_8.1 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9 unaffected 0:3.8.10-4.el9_8 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9 unaffected 0:3.8.10-4.el9_8 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9.4 Update Services For SAP Solutions unaffected 0:3.8.3-4.el9_4.6 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support unaffected 0:3.8.3-6.el9_6.4 * rpm Not specified
CNA Red Hat Red Hat Discovery 2 unaffected 1782159791 * rpm Not specified
CNA Red Hat Red Hat Discovery 2 unaffected 1782166952 * rpm Not specified
CNA Red Hat Red Hat Hardened Images unaffected 3.8.13-1.hum1 * rpm Not specified
CNA Red Hat Red Hat Update Infrastructure 5 unaffected 1781525684 * rpm Not specified
CNA Red Hat Red Hat Update Infrastructure 5 unaffected 1781525671 * rpm Not specified
CNA Red Hat Red Hat Update Infrastructure 5 unaffected 1781525693 * rpm Not specified
CNA Red Hat Red Hat Update Infrastructure 5 unaffected 1781525739 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 6 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux 7 Not specified Not specified
CNA Red Hat Red Hat OpenShift Container Platform 4 Not specified Not specified

References

ReferenceSourceLinkTags
access.redhat.com/errata/RHSA-2026:29197 [email protected] access.redhat.com
bugzilla.redhat.com/show_bug.cgi [email protected] bugzilla.redhat.com
access.redhat.com/errata/RHSA-2026:13274 [email protected] access.redhat.com
access.redhat.com/security/cve/CVE-2026-42011 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:30004 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:33125 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:26319 [email protected] access.redhat.com
www.gnutls.org/security-new.html [email protected] www.gnutls.org
access.redhat.com/errata/RHSA-2026:32962 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:26409 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:30850 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:20612 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:20613 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:30849 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:20611 [email protected] access.redhat.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Red Hat would like to thank Haruto Kimura (Stella) for reporting this issue. (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-05-06T19:06:25.319ZReported to Red Hat.
CNA2026-04-29T00:00:00.000ZMade public.
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