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CVE-2026-42013

Gnutls: gnutls: certificate validation bypass due to oversized subject alternative name PUBLISHED

Description (CNA)

A flaw was found in gnutls. When validating certificates, an oversized Subject Alternative Name (SAN) could cause the validation process to incorrectly fall back to checking the Common Name (CN) field. This could allow a remote attacker to bypass proper certificate validation, potentially leading to spoofing or man-in-the-middle attacks.

Affected (CNA)

Vendor / productVersions
Not supplied / Not suppliedaffected 0
Red Hat / Red Hat Enterprise Linux 10unaffected 0:3.8.10-4.el10_2 before *
Red Hat / Red Hat Enterprise Linux 10.0 Extended Update Supportunaffected 0:3.8.9-9.el10_0.19 before *
Red Hat / Red Hat Enterprise Linux 7 Extended Lifecycle Supportunaffected 0:3.3.29-9.el7_9.2 before *
Red Hat / Red Hat Enterprise Linux 8unaffected 0:3.6.16-8.el8_10.6 before *
Red Hat / Red Hat Enterprise Linux 8unaffected 0:3.6.16-8.el8_10.6 before *
Red Hat / Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Supportunaffected 0:3.6.14-10.el8_4.1 before *
Red Hat / Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Supportunaffected 0:4.13-3.el8_4.1 before *
Red Hat / Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-Onunaffected 0:3.6.14-10.el8_4.1 before *
Red Hat / Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-Onunaffected 0:4.13-3.el8_4.1 before *
Red Hat / Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Supportunaffected 0:3.6.16-5.el8_6.5 before *
Red Hat / Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Supportunaffected 0:4.13-3.el8_6.2 before *
Red Hat / Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-Onunaffected 0:3.6.16-5.el8_6.5 before *
Red Hat / Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-Onunaffected 0:4.13-3.el8_6.2 before *
Red Hat / Red Hat Enterprise Linux 8.8 Telecommunications Update Serviceunaffected 0:3.6.16-7.el8_8.4 before *
Red Hat / Red Hat Enterprise Linux 8.8 Telecommunications Update Serviceunaffected 0:4.13-4.el8_8.1 before *
Red Hat / Red Hat Enterprise Linux 8.8 Update Services for SAP Solutionsunaffected 0:3.6.16-7.el8_8.4 before *
Red Hat / Red Hat Enterprise Linux 8.8 Update Services for SAP Solutionsunaffected 0:4.13-4.el8_8.1 before *
Red Hat / Red Hat Enterprise Linux 9unaffected 0:3.8.10-4.el9_8 before *
Red Hat / Red Hat Enterprise Linux 9unaffected 0:3.8.10-4.el9_8 before *
Red Hat / Red Hat Enterprise Linux 9.2 Update Services for SAP Solutionsunaffected 0:3.7.6-21.el9_2.7 before *
Red Hat / Red Hat Enterprise Linux 9.4 Update Services for SAP Solutionsunaffected 0:3.8.3-4.el9_4.6 before *
Red Hat / Red Hat Enterprise Linux 9.6 Extended Update Supportunaffected 0:3.8.3-6.el9_6.4 before *
Red Hat / Red Hat OpenShift Container Platform 4.12unaffected 412.86.202608241157-0 before *
Red Hat / Red Hat OpenShift Container Platform 4.16unaffected 416.94.202608150307-0 before *
Red Hat / Red Hat OpenShift Container Platform 4.17unaffected 417.94.202608250221-0 before *
Red Hat / Red Hat OpenShift Container Platform 4.18unaffected 418.94.202608142238-0 before *
Red Hat / Red Hat OpenShift Container Platform 4.19unaffected 4.19.9.6.202607151909-0 before *
Red Hat / Cert Manager support for Red Hat OpenShift release 1.17unaffected 1791371080 before *
Red Hat / Cert Manager support for Red Hat OpenShift release 1.17unaffected 1791371069 before *
Red Hat / Cert Manager support for Red Hat OpenShift release 1.17unaffected 1791788287 before *
Red Hat / Cert Manager support for Red Hat OpenShift release 1.17unaffected 1791970484 before *
Red Hat / Cert Manager support for Red Hat OpenShift release 1.18unaffected 1791459707 before *
Red Hat / Cert Manager support for Red Hat OpenShift release 1.18unaffected 1791459711 before *
Red Hat / Cert Manager support for Red Hat OpenShift release 1.18unaffected 1791459759 before *
Red Hat / Cert Manager support for Red Hat OpenShift release 1.18unaffected 1789029076 before *
Red Hat / Cert Manager support for Red Hat OpenShift release 1.18unaffected 1791966259 before *
Red Hat / Cert Manager support for Red Hat OpenShift release 1.20unaffected 1790598593 before *
Red Hat / Red Hat Discovery 2unaffected 1782159791 before *
Red Hat / Red Hat Discovery 2unaffected 1782166952 before *
Red Hat / Red Hat Hardened Imagesunaffected 3.8.13-1.hum1 before *
Red Hat / Red Hat OpenShift AI 3.4unaffected 1790703542 before *
Red Hat / Red Hat Update Infrastructure 5unaffected 1781525684 before *
Red Hat / Red Hat Update Infrastructure 5unaffected 1781525671 before *
Red Hat / Red Hat Update Infrastructure 5unaffected 1781525693 before *
Red Hat / Red Hat Update Infrastructure 5unaffected 1781525739 before *
Red Hat / Red Hat Update Infrastructure 5unaffected 1787241211 before *
Red Hat / Red Hat Update Infrastructure 5unaffected 1787135742 before *
Red Hat / Red Hat Update Infrastructure 5unaffected 1787241260 before *
Red Hat / Red Hat Enterprise Linux 6unknown
Red Hat / Red Hat OpenShift Container Platform 4unaffected

CWE

CWE-295

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.