{
  "threat_severity" : "Important",
  "public_date" : "2026-04-21T12:40:48Z",
  "bugzilla" : {
    "description" : "firefox: thunderbird: Uninitialized memory in the Audio/Video: Web Codecs component",
    "id" : "2460109",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2460109"
  },
  "cvss3" : {
    "cvss3_base_score" : "7.5",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
    "status" : "verified"
  },
  "cwe" : "CWE-824",
  "details" : [ "A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:\nUninitialized memory in the Audio/Video: Web Codecs component" ],
  "statement" : "Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.",
  "affected_release" : [ {
    "product_name" : "Red Hat Enterprise Linux 10",
    "release_date" : "2026-04-27T00:00:00Z",
    "advisory" : "RHSA-2026:10767",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10.1",
    "package" : "firefox-0:140.10.0-1.el10_1"
  }, {
    "product_name" : "Red Hat Enterprise Linux 10",
    "release_date" : "2026-04-30T00:00:00Z",
    "advisory" : "RHSA-2026:12285",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10.1",
    "package" : "thunderbird-0:140.10.0-1.el10_1"
  }, {
    "product_name" : "Red Hat Enterprise Linux 10",
    "release_date" : "2026-05-19T00:00:00Z",
    "advisory" : "RHSA-2026:19041",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10.2",
    "package" : "firefox-0:140.10.0-1.el10_2"
  }, {
    "product_name" : "Red Hat Enterprise Linux 10",
    "release_date" : "2026-05-19T00:00:00Z",
    "advisory" : "RHSA-2026:19131",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10.2",
    "package" : "thunderbird-0:140.10.0-1.el10_2"
  }, {
    "product_name" : "Red Hat Enterprise Linux 10.0 Extended Update Support",
    "release_date" : "2026-05-14T00:00:00Z",
    "advisory" : "RHSA-2026:17690",
    "cpe" : "cpe:/o:redhat:enterprise_linux_eus:10.0",
    "package" : "firefox-0:140.10.0-1.el10_0"
  }, {
    "product_name" : "Red Hat Enterprise Linux 10.0 Extended Update Support",
    "release_date" : "2026-05-20T00:00:00Z",
    "advisory" : "RHSA-2026:19463",
    "cpe" : "cpe:/o:redhat:enterprise_linux_eus:10.0",
    "package" : "thunderbird-0:140.10.0-1.el10_0"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7 Extended Lifecycle Support",
    "release_date" : "2026-05-20T00:00:00Z",
    "advisory" : "RHSA-2026:19704",
    "cpe" : "cpe:/o:redhat:rhel_els:7",
    "package" : "firefox-0:140.10.0-2.el7_9"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "release_date" : "2026-04-27T00:00:00Z",
    "advisory" : "RHSA-2026:10766",
    "cpe" : "cpe:/a:redhat:enterprise_linux:8",
    "package" : "firefox-0:140.10.0-1.el8_10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "release_date" : "2026-05-04T00:00:00Z",
    "advisory" : "RHSA-2026:13537",
    "cpe" : "cpe:/a:redhat:enterprise_linux:8",
    "package" : "thunderbird-0:140.10.0-1.el8_10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support",
    "release_date" : "2026-05-20T00:00:00Z",
    "advisory" : "RHSA-2026:19465",
    "cpe" : "cpe:/a:redhat:rhel_aus:8.4",
    "package" : "thunderbird-0:140.10.0-1.el8_4"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support",
    "release_date" : "2026-05-20T00:00:00Z",
    "advisory" : "RHSA-2026:19655",
    "cpe" : "cpe:/a:redhat:rhel_aus:8.4",
    "package" : "firefox-0:140.10.0-1.el8_4"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On",
    "release_date" : "2026-05-20T00:00:00Z",
    "advisory" : "RHSA-2026:19465",
    "cpe" : "cpe:/a:redhat:rhel_eus_long_life:8.4",
    "package" : "thunderbird-0:140.10.0-1.el8_4"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On",
    "release_date" : "2026-05-20T00:00:00Z",
    "advisory" : "RHSA-2026:19655",
    "cpe" : "cpe:/a:redhat:rhel_eus_long_life:8.4",
    "package" : "firefox-0:140.10.0-1.el8_4"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support",
    "release_date" : "2026-05-20T00:00:00Z",
    "advisory" : "RHSA-2026:19466",
    "cpe" : "cpe:/a:redhat:rhel_aus:8.6",
    "package" : "thunderbird-0:140.10.0-1.el8_6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support",
    "release_date" : "2026-05-20T00:00:00Z",
    "advisory" : "RHSA-2026:19542",
    "cpe" : "cpe:/a:redhat:rhel_aus:8.6",
    "package" : "firefox-0:140.10.0-1.el8_6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.6 Telecommunications Update Service",
    "release_date" : "2026-05-20T00:00:00Z",
    "advisory" : "RHSA-2026:19466",
    "cpe" : "cpe:/a:redhat:rhel_tus:8.6",
    "package" : "thunderbird-0:140.10.0-1.el8_6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.6 Telecommunications Update Service",
    "release_date" : "2026-05-20T00:00:00Z",
    "advisory" : "RHSA-2026:19542",
    "cpe" : "cpe:/a:redhat:rhel_tus:8.6",
    "package" : "firefox-0:140.10.0-1.el8_6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions",
    "release_date" : "2026-05-20T00:00:00Z",
    "advisory" : "RHSA-2026:19466",
    "cpe" : "cpe:/a:redhat:rhel_e4s:8.6",
    "package" : "thunderbird-0:140.10.0-1.el8_6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions",
    "release_date" : "2026-05-20T00:00:00Z",
    "advisory" : "RHSA-2026:19542",
    "cpe" : "cpe:/a:redhat:rhel_e4s:8.6",
    "package" : "firefox-0:140.10.0-1.el8_6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.8 Telecommunications Update Service",
    "release_date" : "2026-05-14T00:00:00Z",
    "advisory" : "RHSA-2026:17477",
    "cpe" : "cpe:/a:redhat:rhel_tus:8.8",
    "package" : "firefox-0:140.10.0-1.el8_8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.8 Telecommunications Update Service",
    "release_date" : "2026-05-20T00:00:00Z",
    "advisory" : "RHSA-2026:19467",
    "cpe" : "cpe:/a:redhat:rhel_tus:8.8",
    "package" : "thunderbird-0:140.10.0-1.el8_8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions",
    "release_date" : "2026-05-14T00:00:00Z",
    "advisory" : "RHSA-2026:17477",
    "cpe" : "cpe:/a:redhat:rhel_e4s:8.8",
    "package" : "firefox-0:140.10.0-1.el8_8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions",
    "release_date" : "2026-05-20T00:00:00Z",
    "advisory" : "RHSA-2026:19467",
    "cpe" : "cpe:/a:redhat:rhel_e4s:8.8",
    "package" : "thunderbird-0:140.10.0-1.el8_8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2026-04-27T00:00:00Z",
    "advisory" : "RHSA-2026:10757",
    "cpe" : "cpe:/a:redhat:enterprise_linux:9",
    "package" : "firefox-0:140.10.0-1.el9_7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2026-05-11T00:00:00Z",
    "advisory" : "RHSA-2026:15892",
    "cpe" : "cpe:/a:redhat:enterprise_linux:9",
    "package" : "thunderbird-0:140.10.0-1.el9_7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2026-05-19T00:00:00Z",
    "advisory" : "RHSA-2026:19201",
    "cpe" : "cpe:/a:redhat:enterprise_linux:9",
    "package" : "firefox-0:140.10.0-1.el9_8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2026-05-19T00:00:00Z",
    "advisory" : "RHSA-2026:19348",
    "cpe" : "cpe:/a:redhat:enterprise_linux:9",
    "package" : "thunderbird-0:140.10.1-1.el9_8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions",
    "release_date" : "2026-05-14T00:00:00Z",
    "advisory" : "RHSA-2026:17687",
    "cpe" : "cpe:/a:redhat:rhel_e4s:9.0",
    "package" : "firefox-0:140.10.0-1.el9_0"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions",
    "release_date" : "2026-05-20T00:00:00Z",
    "advisory" : "RHSA-2026:19468",
    "cpe" : "cpe:/a:redhat:rhel_e4s:9.0",
    "package" : "thunderbird-0:140.10.0-1.el9_0"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions",
    "release_date" : "2026-05-14T00:00:00Z",
    "advisory" : "RHSA-2026:17689",
    "cpe" : "cpe:/a:redhat:rhel_e4s:9.2",
    "package" : "firefox-0:140.10.0-1.el9_2"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions",
    "release_date" : "2026-05-20T00:00:00Z",
    "advisory" : "RHSA-2026:19461",
    "cpe" : "cpe:/a:redhat:rhel_e4s:9.2",
    "package" : "thunderbird-0:140.10.0-1.el9_2"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.4 Extended Update Support",
    "release_date" : "2026-05-20T00:00:00Z",
    "advisory" : "RHSA-2026:19464",
    "cpe" : "cpe:/a:redhat:rhel_eus:9.4",
    "package" : "firefox-0:140.10.0-1.el9_4"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.4 Extended Update Support",
    "release_date" : "2026-05-20T00:00:00Z",
    "advisory" : "RHSA-2026:19469",
    "cpe" : "cpe:/a:redhat:rhel_eus:9.4",
    "package" : "thunderbird-0:140.10.0-1.el9_4"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.6 Extended Update Support",
    "release_date" : "2026-05-14T00:00:00Z",
    "advisory" : "RHSA-2026:17688",
    "cpe" : "cpe:/a:redhat:rhel_eus:9.6",
    "package" : "firefox-0:140.10.0-1.el9_6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.6 Extended Update Support",
    "release_date" : "2026-05-20T00:00:00Z",
    "advisory" : "RHSA-2026:19462",
    "cpe" : "cpe:/a:redhat:rhel_eus:9.6",
    "package" : "thunderbird-0:140.10.0-1.el9_6"
  } ],
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 10",
    "fix_state" : "Affected",
    "package_name" : "rhel10/firefox-flatpak",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 10",
    "fix_state" : "Affected",
    "package_name" : "rhel10/thunderbird-flatpak",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 6",
    "fix_state" : "Out of support scope",
    "package_name" : "firefox",
    "cpe" : "cpe:/o:redhat:enterprise_linux:6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 6",
    "fix_state" : "Out of support scope",
    "package_name" : "thunderbird",
    "cpe" : "cpe:/o:redhat:enterprise_linux:6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Out of support scope",
    "package_name" : "thunderbird",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2026-6751\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-6751\nhttps://www.mozilla.org/security/advisories/mfsa2026-32/#CVE-2026-6751\nhttps://www.mozilla.org/security/advisories/mfsa2026-34/#CVE-2026-6751" ],
  "name" : "CVE-2026-6751",
  "csaw" : false
}