--- id: CVE-2026-42011 title: A flaw was found in gnutls summary: >- 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 byp… severity: high cvss: 7.4 cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N' cwe: - CWE-295 vendor: Red Hat product: gnutls affected: - gnutls all versions - gnutls (all versions) - gnutls (all versions) - gnutls (all versions) - gnutls (all versions) - gnutls (all versions) - gnutls (all versions) - libtasn1 (all versions) - gnutls (all versions) - libtasn1 (all versions) - gnutls (all versions) - libtasn1 (all versions) - gnutls (all versions) - libtasn1 (all versions) - gnutls (all versions) - libtasn1 (all versions) - gnutls (all versions) - libtasn1 (all versions) - gnutls (all versions) - gnutls (all versions) - gnutls (all versions) - gnutls (all versions) - gnutls (all versions) - rhcos (all versions) - rhcos (all versions) - rhcos (all versions) - rhcos (all versions) - rhcos (all versions) - cert-manager/cert-manager-trust-manager-rhel9 (all versions) - discovery/discovery-server-rhel9 (all versions) - discovery/discovery-ui-rhel9 (all versions) - gnutls-main (all versions) - rhai/base-image-neuron-rhel9 (all versions) - rhui5/cds-rhel9 (all versions) - rhui5/haproxy-rhel9 (all versions) - rhui5/installer-rhel9 (all versions) - rhui5/rhua-rhel9 (all versions) - rhui5/cds-kubernetes-tp-rhel9 (all versions) - rhui5/installer-tp-rhel9 (all versions) - rhui5/rhua-tp-rhel9 (all versions) - gnutls - openshift4/ose-hypershift-rhel9 - openshift/ose-rhel-coreos-8 (all versions) patched: - enterprise_linux_server_v_7_els - openshift_container_platform 4.12 - openshift_container_platform 4.16 - openshift_container_platform 4.17 - openshift_container_platform 4.18 - openshift_container_platform 4.19 - enterprise_linux_appstream_eus_v_10_0 - enterprise_linux_appstream_v_10 - enterprise_linux_appstream_v_8 - enterprise_linux_appstream_aus_v_8_4 - enterprise_linux_appstream_eus_extension_v_8_4 - enterprise_linux_appstream_aus_v_8_6 - enterprise_linux_appstream_eus_extension_v_8_6 - enterprise_linux_appstream_e4s_v_8_8 - enterprise_linux_appstream_tus_v_8_8 - enterprise_linux_appstream_e4s_v_9_2 - enterprise_linux_appstream_e4s_v_9_4 - enterprise_linux_appstream_eus_v_9_6 - enterprise_linux_appstream_v_9 - enterprise_linux_baseos_eus_v_10_0 - enterprise_linux_baseos_v_10 - enterprise_linux_baseos_v_8 - enterprise_linux_baseos_aus_v_8_4 - enterprise_linux_baseos_eus_extension_v_8_4 - enterprise_linux_baseos_aus_v_8_6 - enterprise_linux_baseos_eus_extension_v_8_6 - enterprise_linux_baseos_e4s_v_8_8 - enterprise_linux_baseos_tus_v_8_8 - enterprise_linux_baseos_e4s_v_9_2 - enterprise_linux_baseos_e4s_v_9_4 - enterprise_linux_baseos_eus_v_9_6 - enterprise_linux_baseos_v_9 - cert_manager_support_for_red_hat_openshift_release 1.20 - discovery 2 - hardened_images - update_infrastructure 5 published: '2026-05-07' updated: '2026-10-14' sourceUpdated: '2026-10-14T20:17:41.300' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-42011' references: - url: 'https://access.redhat.com/errata/RHSA-2026:13274' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:20611' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:20612' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:20613' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:26319' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:26409' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:29197' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:30004' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:30849' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:30850' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:32962' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:33125' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:40762' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:41921' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:43575' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:56853' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:57483' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:58981' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:59831' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:60019' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:72502' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:74674' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:82304' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:82322' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:82347' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:82354' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:82372' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:82857' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:82888' label: secalert@redhat.com - url: 'https://access.redhat.com/security/cve/CVE-2026-42011' label: secalert@redhat.com - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2467437' label: secalert@redhat.com - url: 'https://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-6' label: secalert@redhat.com - url: >- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42011.json - url: 'https://www.cve.org/CVERecord?id=CVE-2026-42011' - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-42011' tags: - nvd - cve.org - csaf - vex - red-hat epss: 0.00475 epssPercentile: 0.40872 ssvc: exploitation: none automatable: 'no' technicalImpact: total timestamp: '2026-05-07T00:00:00+00:00' ingestedAt: '2026-06-26T16:43:13.639Z' --- ## Overview 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. ## Remediation Refer to the linked advisories for vendor-supplied fixes and affected version ranges. ## Vendor advisories - **RHSA-2026:43575** · Red Hat · fixed in: Red Hat Enterprise Linux Server (v. 7 ELS) · released 2026-07-22 · [advisory](https://access.redhat.com/errata/RHSA-2026:43575) - **RHSA-2026:59831** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.12 · released 2026-09-03 · [advisory](https://access.redhat.com/errata/RHSA-2026:59831) - **RHSA-2026:56853** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.16 · released 2026-08-31 · [advisory](https://access.redhat.com/errata/RHSA-2026:56853) - **RHSA-2026:60019** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.17 · released 2026-09-03 · [advisory](https://access.redhat.com/errata/RHSA-2026:60019) - **RHSA-2026:57483** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.18 · released 2026-08-26 · [advisory](https://access.redhat.com/errata/RHSA-2026:57483) - **RHSA-2026:40762** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.19 · released 2026-07-22 · [advisory](https://access.redhat.com/errata/RHSA-2026:40762) - **RHSA-2026:26409** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux BaseOS EUS (v. 10.0) · released 2026-06-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:26409) - **RHSA-2026:20613** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10) · released 2026-05-26 · [advisory](https://access.redhat.com/errata/RHSA-2026:20613) - **RHSA-2026:20611** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8), Red Hat Enterprise Linux BaseOS (v. 8) · released 2026-05-26 · [advisory](https://access.redhat.com/errata/RHSA-2026:20611) - **RHSA-2026:33125** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream AUS (v.8.4), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4), Red Hat Enterprise Linux BaseOS AUS (v.8.4), Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) · released 2026-06-29 · [advisory](https://access.redhat.com/errata/RHSA-2026:33125) - **RHSA-2026:30849** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream AUS (v.8.6), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6), Red Hat Enterprise Linux BaseOS AUS (v.8.6), Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6) · released 2026-06-29 · [advisory](https://access.redhat.com/errata/RHSA-2026:30849) - **Red Hat VEX** · Moderate · affected: Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat OpenShift Container Platform 4 · updated 2026-10-06 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42011.json)