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CVE Vulnerabilities

CVE-2026-42011

Improper Certificate Validation

Published: May 07, 2026 | Modified: Jun 30, 2026
CVSS 3.x
N/A
Source:
NVD
CVSS 2.x
RedHat/V2
RedHat/V3
7.4 MODERATE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Ubuntu
MEDIUM
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Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2026-42011
CWEhttps://cwe.mitre.org/data/definitions/295.html

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.

Weakness

The product does not validate, or incorrectly validates, a certificate.

Affected Software

NameVendorStart VersionEnd Version
Red Hat Enterprise Linux 10RedHatgnutls-0:3.8.10-4.el10_2*
Red Hat Enterprise Linux 10.0 Extended Update SupportRedHatgnutls-0:3.8.9-9.el10_0.19*
Red Hat Enterprise Linux 8RedHatgnutls-0:3.6.16-8.el8_10.6*
Red Hat Enterprise Linux 8RedHatgnutls-0:3.6.16-8.el8_10.6*
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportRedHatgnutls-0:3.6.14-10.el8_4.1*
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportRedHatlibtasn1-0:4.13-3.el8_4.1*
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-OnRedHatgnutls-0:3.6.14-10.el8_4.1*
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-OnRedHatlibtasn1-0:4.13-3.el8_4.1*
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportRedHatgnutls-0:3.6.16-5.el8_6.5*
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportRedHatlibtasn1-0:4.13-3.el8_6.2*
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-OnRedHatgnutls-0:3.6.16-5.el8_6.5*
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-OnRedHatlibtasn1-0:4.13-3.el8_6.2*
Red Hat Enterprise Linux 8.8 Telecommunications Update ServiceRedHatgnutls-0:3.6.16-7.el8_8.4*
Red Hat Enterprise Linux 8.8 Telecommunications Update ServiceRedHatlibtasn1-0:4.13-4.el8_8.1*
Red Hat Enterprise Linux 8.8 Update Services for SAP SolutionsRedHatgnutls-0:3.6.16-7.el8_8.4*
Red Hat Enterprise Linux 8.8 Update Services for SAP SolutionsRedHatlibtasn1-0:4.13-4.el8_8.1*
Red Hat Enterprise Linux 9RedHatgnutls-0:3.8.10-4.el9_8*
Red Hat Enterprise Linux 9RedHatgnutls-0:3.8.10-4.el9_8*
Red Hat Enterprise Linux 9.4 Update Services for SAP SolutionsRedHatgnutls-0:3.8.3-4.el9_4.6*
Red Hat Enterprise Linux 9.6 Extended Update SupportRedHatgnutls-0:3.8.3-6.el9_6.4*
Red Hat Discovery 2RedHatdiscovery/discovery-server-rhel9:1782159791*
Red Hat Discovery 2RedHatdiscovery/discovery-ui-rhel9:1782166952*
Red Hat Hardened ImagesRedHatgnutls-main-3.8.13-1.hum1*
Red Hat Update Infrastructure 5RedHatrhui5/cds-rhel9:1781525684*
Red Hat Update Infrastructure 5RedHatrhui5/haproxy-rhel9:1781525671*
Red Hat Update Infrastructure 5RedHatrhui5/installer-rhel9:1781525693*
Red Hat Update Infrastructure 5RedHatrhui5/rhua-rhel9:1781525739*
Gnutls28Ubuntuesm-infra/xenial*
Gnutls28Ubuntufips-preview/jammy*
Gnutls28Ubuntufips-updates/jammy*
Gnutls28Ubuntufips-updates/noble*
Gnutls28Ubuntujammy*
Gnutls28Ubuntunoble*
Gnutls28Ubuntuquesting*
Gnutls28Ubunturesolute*
Gnutls28Ubuntuupstream*

Potential Mitigations

References

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