{
  "threat_severity" : "Important",
  "public_date" : "2026-03-24T12:30:43Z",
  "bugzilla" : {
    "description" : "firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149",
    "id" : "2450751",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2450751"
  },
  "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-120",
  "details" : [ "Memory safety bugs present in Firefox ESR 140.8, Thunderbird ESR 140.8, Firefox 148 and Thunderbird 148. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.", "A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:\nMemory safety bugs present in Firefox ESR 140.8, Thunderbird ESR 140.8, Firefox 148 and Thunderbird 148. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code." ],
  "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" : "2026-03-26T00:00:00Z",
    "advisory" : "RHSA-2026:5931",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10.1",
    "package" : "firefox-0:140.9.0-1.el10_1"
  }, {
    "product_name" : "Red Hat Enterprise Linux 10",
    "release_date" : "2026-04-01T00:00:00Z",
    "advisory" : "RHSA-2026:6342",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10.1",
    "package" : "thunderbird-0:140.9.0-1.el10_1"
  }, {
    "product_name" : "Red Hat Enterprise Linux 10.0 Extended Update Support",
    "release_date" : "2026-04-13T00:00:00Z",
    "advisory" : "RHSA-2026:7843",
    "cpe" : "cpe:/o:redhat:enterprise_linux_eus:10.0",
    "package" : "firefox-0:140.9.0-1.el10_0"
  }, {
    "product_name" : "Red Hat Enterprise Linux 10.0 Extended Update Support",
    "release_date" : "2026-04-15T00:00:00Z",
    "advisory" : "RHSA-2026:8315",
    "cpe" : "cpe:/o:redhat:enterprise_linux_eus:10.0",
    "package" : "thunderbird-0:140.9.0-1.el10_0"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7 Extended Lifecycle Support",
    "release_date" : "2026-04-16T00:00:00Z",
    "advisory" : "RHSA-2026:8427",
    "cpe" : "cpe:/o:redhat:rhel_els:7",
    "package" : "firefox-0:140.9.0-1.el7_9"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "release_date" : "2026-03-26T00:00:00Z",
    "advisory" : "RHSA-2026:5932",
    "cpe" : "cpe:/a:redhat:enterprise_linux:8",
    "package" : "firefox-0:140.9.0-1.el8_10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "release_date" : "2026-04-07T00:00:00Z",
    "advisory" : "RHSA-2026:6917",
    "cpe" : "cpe:/a:redhat:enterprise_linux:8",
    "package" : "thunderbird-0:140.9.0-1.el8_10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.2 Advanced Update Support",
    "release_date" : "2026-04-13T00:00:00Z",
    "advisory" : "RHSA-2026:7840",
    "cpe" : "cpe:/a:redhat:rhel_aus:8.2",
    "package" : "firefox-0:140.9.0-1.el8_2"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.2 Advanced Update Support",
    "release_date" : "2026-04-15T00:00:00Z",
    "advisory" : "RHSA-2026:8285",
    "cpe" : "cpe:/a:redhat:rhel_aus:8.2",
    "package" : "thunderbird-0:140.9.0-1.el8_2"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support",
    "release_date" : "2026-04-13T00:00:00Z",
    "advisory" : "RHSA-2026:7858",
    "cpe" : "cpe:/a:redhat:rhel_aus:8.4",
    "package" : "firefox-0:140.9.0-1.el8_4"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support",
    "release_date" : "2026-04-20T00:00:00Z",
    "advisory" : "RHSA-2026:8850",
    "cpe" : "cpe:/a:redhat:rhel_aus:8.4",
    "package" : "thunderbird-0:140.9.0-1.el8_4"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On",
    "release_date" : "2026-04-13T00:00:00Z",
    "advisory" : "RHSA-2026:7858",
    "cpe" : "cpe:/a:redhat:rhel_eus_long_life:8.4",
    "package" : "firefox-0:140.9.0-1.el8_4"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On",
    "release_date" : "2026-04-20T00:00:00Z",
    "advisory" : "RHSA-2026:8850",
    "cpe" : "cpe:/a:redhat:rhel_eus_long_life:8.4",
    "package" : "thunderbird-0:140.9.0-1.el8_4"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support",
    "release_date" : "2026-04-13T00:00:00Z",
    "advisory" : "RHSA-2026:7842",
    "cpe" : "cpe:/a:redhat:rhel_aus:8.6",
    "package" : "firefox-0:140.9.0-1.el8_6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support",
    "release_date" : "2026-04-15T00:00:00Z",
    "advisory" : "RHSA-2026:8289",
    "cpe" : "cpe:/a:redhat:rhel_aus:8.6",
    "package" : "thunderbird-0:140.9.0-1.el8_6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.6 Telecommunications Update Service",
    "release_date" : "2026-04-13T00:00:00Z",
    "advisory" : "RHSA-2026:7842",
    "cpe" : "cpe:/a:redhat:rhel_tus:8.6",
    "package" : "firefox-0:140.9.0-1.el8_6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.6 Telecommunications Update Service",
    "release_date" : "2026-04-15T00:00:00Z",
    "advisory" : "RHSA-2026:8289",
    "cpe" : "cpe:/a:redhat:rhel_tus:8.6",
    "package" : "thunderbird-0:140.9.0-1.el8_6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions",
    "release_date" : "2026-04-13T00:00:00Z",
    "advisory" : "RHSA-2026:7842",
    "cpe" : "cpe:/a:redhat:rhel_e4s:8.6",
    "package" : "firefox-0:140.9.0-1.el8_6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions",
    "release_date" : "2026-04-15T00:00:00Z",
    "advisory" : "RHSA-2026:8289",
    "cpe" : "cpe:/a:redhat:rhel_e4s:8.6",
    "package" : "thunderbird-0:140.9.0-1.el8_6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.8 Telecommunications Update Service",
    "release_date" : "2026-04-13T00:00:00Z",
    "advisory" : "RHSA-2026:7838",
    "cpe" : "cpe:/a:redhat:rhel_tus:8.8",
    "package" : "firefox-0:140.9.0-1.el8_8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.8 Telecommunications Update Service",
    "release_date" : "2026-04-15T00:00:00Z",
    "advisory" : "RHSA-2026:8288",
    "cpe" : "cpe:/a:redhat:rhel_tus:8.8",
    "package" : "thunderbird-0:140.9.0-1.el8_8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions",
    "release_date" : "2026-04-13T00:00:00Z",
    "advisory" : "RHSA-2026:7838",
    "cpe" : "cpe:/a:redhat:rhel_e4s:8.8",
    "package" : "firefox-0:140.9.0-1.el8_8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions",
    "release_date" : "2026-04-15T00:00:00Z",
    "advisory" : "RHSA-2026:8288",
    "cpe" : "cpe:/a:redhat:rhel_e4s:8.8",
    "package" : "thunderbird-0:140.9.0-1.el8_8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2026-03-26T00:00:00Z",
    "advisory" : "RHSA-2026:5930",
    "cpe" : "cpe:/a:redhat:enterprise_linux:9",
    "package" : "firefox-0:140.9.0-1.el9_7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2026-03-30T00:00:00Z",
    "advisory" : "RHSA-2026:6188",
    "cpe" : "cpe:/a:redhat:enterprise_linux:9",
    "package" : "thunderbird-0:140.9.0-1.el9_7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions",
    "release_date" : "2026-04-13T00:00:00Z",
    "advisory" : "RHSA-2026:7839",
    "cpe" : "cpe:/a:redhat:rhel_e4s:9.0",
    "package" : "firefox-0:140.9.0-1.el9_0"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions",
    "release_date" : "2026-04-15T00:00:00Z",
    "advisory" : "RHSA-2026:8286",
    "cpe" : "cpe:/a:redhat:rhel_e4s:9.0",
    "package" : "thunderbird-0:140.9.0-1.el9_0"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions",
    "release_date" : "2026-04-13T00:00:00Z",
    "advisory" : "RHSA-2026:7841",
    "cpe" : "cpe:/a:redhat:rhel_e4s:9.2",
    "package" : "firefox-0:140.9.0-1.el9_2"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions",
    "release_date" : "2026-04-15T00:00:00Z",
    "advisory" : "RHSA-2026:8287",
    "cpe" : "cpe:/a:redhat:rhel_e4s:9.2",
    "package" : "thunderbird-0:140.9.0-1.el9_2"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.4 Extended Update Support",
    "release_date" : "2026-04-13T00:00:00Z",
    "advisory" : "RHSA-2026:7845",
    "cpe" : "cpe:/a:redhat:rhel_eus:9.4",
    "package" : "firefox-0:140.9.0-1.el9_4"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.4 Extended Update Support",
    "release_date" : "2026-04-15T00:00:00Z",
    "advisory" : "RHSA-2026:8290",
    "cpe" : "cpe:/a:redhat:rhel_eus:9.4",
    "package" : "thunderbird-0:140.9.0-1.el9_4"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.6 Extended Update Support",
    "release_date" : "2026-04-13T00:00:00Z",
    "advisory" : "RHSA-2026:7837",
    "cpe" : "cpe:/a:redhat:rhel_eus:9.6",
    "package" : "firefox-0:140.9.0-1.el9_6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.6 Extended Update Support",
    "release_date" : "2026-04-15T00:00:00Z",
    "advisory" : "RHSA-2026:8284",
    "cpe" : "cpe:/a:redhat:rhel_eus:9.6",
    "package" : "thunderbird-0:140.9.0-1.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-2026-4720\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-4720\nhttps://www.mozilla.org/security/advisories/mfsa2026-22/#CVE-2026-4720\nhttps://www.mozilla.org/security/advisories/mfsa2026-24/#CVE-2026-4720" ],
  "name" : "CVE-2026-4720",
  "csaw" : false
}