{
  "threat_severity" : "Moderate",
  "public_date" : "2026-04-29T00:00:00Z",
  "bugzilla" : {
    "description" : "gnutls: gnutls: Certificate validation bypass due to oversized Subject Alternative Name",
    "id" : "2467448",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2467448"
  },
  "cvss3" : {
    "cvss3_base_score" : "8.2",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N",
    "status" : "verified"
  },
  "cwe" : "CWE-295",
  "details" : [ "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.", "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." ],
  "acknowledgement" : "Red Hat would like to thank Haruto Kimura (Stella) and Joshua Rogers (AISLE Research Team) for reporting this issue.",
  "affected_release" : [ {
    "product_name" : "Red Hat Enterprise Linux 10",
    "release_date" : "2026-05-26T00:00:00Z",
    "advisory" : "RHSA-2026:20613",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10.2",
    "package" : "gnutls-0:3.8.10-4.el10_2"
  }, {
    "product_name" : "Red Hat Enterprise Linux 10.0 Extended Update Support",
    "release_date" : "2026-06-16T00:00:00Z",
    "advisory" : "RHSA-2026:26409",
    "cpe" : "cpe:/o:redhat:enterprise_linux_eus:10.0",
    "package" : "gnutls-0:3.8.9-9.el10_0.19"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "release_date" : "2026-05-26T00:00:00Z",
    "advisory" : "RHSA-2026:20611",
    "cpe" : "cpe:/a:redhat:enterprise_linux:8",
    "package" : "gnutls-0:3.6.16-8.el8_10.6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "release_date" : "2026-05-26T00:00:00Z",
    "advisory" : "RHSA-2026:20611",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8",
    "package" : "gnutls-0:3.6.16-8.el8_10.6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support",
    "release_date" : "2026-06-29T00:00:00Z",
    "advisory" : "RHSA-2026:33125",
    "cpe" : "cpe:/a:redhat:rhel_aus:8.4",
    "package" : "gnutls-0:3.6.14-10.el8_4.1"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support",
    "release_date" : "2026-06-29T00:00:00Z",
    "advisory" : "RHSA-2026:33125",
    "cpe" : "cpe:/a:redhat:rhel_aus:8.4",
    "package" : "libtasn1-0:4.13-3.el8_4.1"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On",
    "release_date" : "2026-06-29T00:00:00Z",
    "advisory" : "RHSA-2026:33125",
    "cpe" : "cpe:/a:redhat:rhel_eus_long_life:8.4",
    "package" : "gnutls-0:3.6.14-10.el8_4.1"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On",
    "release_date" : "2026-06-29T00:00:00Z",
    "advisory" : "RHSA-2026:33125",
    "cpe" : "cpe:/a:redhat:rhel_eus_long_life:8.4",
    "package" : "libtasn1-0:4.13-3.el8_4.1"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support",
    "release_date" : "2026-06-29T00:00:00Z",
    "advisory" : "RHSA-2026:30849",
    "cpe" : "cpe:/a:redhat:rhel_aus:8.6",
    "package" : "gnutls-0:3.6.16-5.el8_6.5"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support",
    "release_date" : "2026-06-29T00:00:00Z",
    "advisory" : "RHSA-2026:30849",
    "cpe" : "cpe:/a:redhat:rhel_aus:8.6",
    "package" : "libtasn1-0:4.13-3.el8_6.2"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On",
    "release_date" : "2026-06-29T00:00:00Z",
    "advisory" : "RHSA-2026:30849",
    "cpe" : "cpe:/a:redhat:rhel_eus_long_life:8.6",
    "package" : "gnutls-0:3.6.16-5.el8_6.5"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On",
    "release_date" : "2026-06-29T00:00:00Z",
    "advisory" : "RHSA-2026:30849",
    "cpe" : "cpe:/a:redhat:rhel_eus_long_life:8.6",
    "package" : "libtasn1-0:4.13-3.el8_6.2"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.8 Telecommunications Update Service",
    "release_date" : "2026-06-29T00:00:00Z",
    "advisory" : "RHSA-2026:30850",
    "cpe" : "cpe:/a:redhat:rhel_tus:8.8",
    "package" : "gnutls-0:3.6.16-7.el8_8.4"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.8 Telecommunications Update Service",
    "release_date" : "2026-06-29T00:00:00Z",
    "advisory" : "RHSA-2026:30850",
    "cpe" : "cpe:/a:redhat:rhel_tus:8.8",
    "package" : "libtasn1-0:4.13-4.el8_8.1"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions",
    "release_date" : "2026-06-29T00:00:00Z",
    "advisory" : "RHSA-2026:30850",
    "cpe" : "cpe:/a:redhat:rhel_e4s:8.8",
    "package" : "gnutls-0:3.6.16-7.el8_8.4"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions",
    "release_date" : "2026-06-29T00:00:00Z",
    "advisory" : "RHSA-2026:30850",
    "cpe" : "cpe:/a:redhat:rhel_e4s:8.8",
    "package" : "libtasn1-0:4.13-4.el8_8.1"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2026-05-26T00:00:00Z",
    "advisory" : "RHSA-2026:20612",
    "cpe" : "cpe:/a:redhat:enterprise_linux:9",
    "package" : "gnutls-0:3.8.10-4.el9_8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2026-05-26T00:00:00Z",
    "advisory" : "RHSA-2026:20612",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9",
    "package" : "gnutls-0:3.8.10-4.el9_8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions",
    "release_date" : "2026-07-20T00:00:00Z",
    "advisory" : "RHSA-2026:41921",
    "cpe" : "cpe:/a:redhat:rhel_e4s:9.2",
    "package" : "gnutls-0:3.7.6-21.el9_2.7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions",
    "release_date" : "2026-06-29T00:00:00Z",
    "advisory" : "RHSA-2026:32962",
    "cpe" : "cpe:/a:redhat:rhel_e4s:9.4",
    "package" : "gnutls-0:3.8.3-4.el9_4.6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.6 Extended Update Support",
    "release_date" : "2026-06-25T00:00:00Z",
    "advisory" : "RHSA-2026:30004",
    "cpe" : "cpe:/a:redhat:rhel_eus:9.6",
    "package" : "gnutls-0:3.8.3-6.el9_6.4"
  }, {
    "product_name" : "Red Hat Discovery 2",
    "release_date" : "2026-06-24T00:00:00Z",
    "advisory" : "RHSA-2026:29197",
    "cpe" : "cpe:/a:redhat:discovery:2::el9",
    "package" : "discovery/discovery-server-rhel9:1782159791"
  }, {
    "product_name" : "Red Hat Discovery 2",
    "release_date" : "2026-06-24T00:00:00Z",
    "advisory" : "RHSA-2026:29197",
    "cpe" : "cpe:/a:redhat:discovery:2::el9",
    "package" : "discovery/discovery-ui-rhel9:1782166952"
  }, {
    "product_name" : "Red Hat Hardened Images",
    "release_date" : "2026-05-02T00:00:00Z",
    "advisory" : "RHSA-2026:13274",
    "cpe" : "cpe:/a:redhat:hummingbird:1",
    "package" : "gnutls-main-3.8.13-1.hum1",
    "impact" : "moderate"
  }, {
    "product_name" : "Red Hat Update Infrastructure 5",
    "release_date" : "2026-06-16T00:00:00Z",
    "advisory" : "RHSA-2026:26319",
    "cpe" : "cpe:/a:redhat:rhui:5::el9",
    "package" : "rhui5/cds-rhel9:1781525684"
  }, {
    "product_name" : "Red Hat Update Infrastructure 5",
    "release_date" : "2026-06-16T00:00:00Z",
    "advisory" : "RHSA-2026:26319",
    "cpe" : "cpe:/a:redhat:rhui:5::el9",
    "package" : "rhui5/haproxy-rhel9:1781525671"
  }, {
    "product_name" : "Red Hat Update Infrastructure 5",
    "release_date" : "2026-06-16T00:00:00Z",
    "advisory" : "RHSA-2026:26319",
    "cpe" : "cpe:/a:redhat:rhui:5::el9",
    "package" : "rhui5/installer-rhel9:1781525693"
  }, {
    "product_name" : "Red Hat Update Infrastructure 5",
    "release_date" : "2026-06-16T00:00:00Z",
    "advisory" : "RHSA-2026:26319",
    "cpe" : "cpe:/a:redhat:rhui:5::el9",
    "package" : "rhui5/rhua-rhel9:1781525739"
  } ],
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 6",
    "fix_state" : "Out of support scope",
    "package_name" : "gnutls",
    "cpe" : "cpe:/o:redhat:enterprise_linux:6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Affected",
    "package_name" : "gnutls",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat OpenShift Container Platform 4",
    "fix_state" : "Under investigation",
    "package_name" : "openshift4/ose-hypershift-rhel9",
    "cpe" : "cpe:/a:redhat:openshift:4"
  }, {
    "product_name" : "Red Hat OpenShift Container Platform 4",
    "fix_state" : "Affected",
    "package_name" : "rhcos",
    "cpe" : "cpe:/a:redhat:openshift:4"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2026-42013\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-42013\nhttps://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-8" ],
  "name" : "CVE-2026-42013",
  "csaw" : false
}