--- id: CVE-2026-5260 title: A flaw was found in libgnutls summary: >- A flaw was found in libgnutls. A remote attacker, by sending an extremely short premaster secret during an RSA key exchange to a server using an RSA key backed by a PKCS#11 token, could trigger a short heap overread. This memory corrupti… severity: high cvss: 8.2 cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H' cwe: - CWE-126 vendor: Red Hat product: gnutls affected: - 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) - openshift/ose-rhel-coreos-8 (all versions) - openshift/ose-rhel-coreos-9 (all versions) - openshift/ose-rhel-coreos-9 (all versions) - openshift/ose-rhel-coreos-9 (all versions) - openshift/ose-rhel-coreos-9 (all versions) - openshift/ose-rhel-coreos-9 (all versions) - openshift/ose-rhel-coreos-9 (all versions) - cert-manager/jetstack-cert-manager-acmesolver-rhel9 (all versions) - cert-manager/jetstack-cert-manager-rhel9 (all versions) - cert-manager/cert-manager-operator-rhel9 (all versions) - cert-manager/cert-manager-operator-bundle (all versions) - cert-manager/jetstack-cert-manager-acmesolver-rhel9 (all versions) - cert-manager/jetstack-cert-manager-rhel9 (all versions) - cert-manager/cert-manager-istio-csr-rhel9 (all versions) - cert-manager/cert-manager-operator-rhel9 (all versions) - cert-manager/cert-manager-operator-bundle (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) patched: - openshift_container_platform 4.12 - openshift_container_platform 4.14 - 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 - discovery 2 - hardened_images - update_infrastructure 5 published: '2026-05-26' updated: '2026-10-15' sourceUpdated: '2026-10-15T17:17:25.673' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-5260' 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-2026:56853' 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-2026:67837' 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-2026:77320' 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-2026-5260' label: secalert@redhat.com - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2467450' label: secalert@redhat.com - url: 'https://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-10' label: secalert@redhat.com - url: >- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-5260.json - url: 'https://www.cve.org/CVERecord?id=CVE-2026-5260' - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-5260' - url: 'https://access.redhat.com/errata/RHSA-2026:82811' label: 'RHSA-2026:82811' tags: - nvd - cve.org - csaf - vex - red-hat ssvc: exploitation: none automatable: 'yes' technicalImpact: partial timestamp: '2026-05-27T13:36:46.793551Z' epss: 0.00769 epssPercentile: 0.55391 ingestedAt: '2026-06-29T13:42:11.964Z' --- ## Overview A flaw was found in libgnutls. A remote attacker, by sending an extremely short premaster secret during an RSA key exchange to a server using an RSA key backed by a PKCS#11 token, could trigger a short heap overread. This memory corruption vulnerability could lead to information disclosure. ## Remediation Refer to the linked advisories for vendor-supplied fixes and affected version ranges. ## Vendor advisories - **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-2026:67837** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.14 · released 2026-09-24 · [advisory](https://access.redhat.com/errata/RHSA-2026:67837) - **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 Enterprise Linux 6 · no fix planned: Red Hat Enterprise Linux 6 · updated 2026-10-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-5260.json)