{
  "threat_severity" : "Important",
  "public_date" : "2026-03-24T20:27:15Z",
  "bugzilla" : {
    "description" : "thunderbird: Out of bounds read in IMAP parsing",
    "id" : "2451001",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2451001"
  },
  "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:N/A:H",
    "status" : "verified"
  },
  "cwe" : "CWE-130",
  "details" : [ "A malicious mail server could send malformed strings with negative lengths, causing the parser to read memory outside the buffer. If a mail server or connection to a mail server were compromised, an attacker could cause the parser to malfunction, potentially crashing Thunderbird or leaking sensitive data. This vulnerability was fixed in Thunderbird 149 and Thunderbird 140.9.", "A flaw was found in Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:\nA malicious mail server could send malformed strings with negative lengths, causing the parser to read memory outside the buffer. If a mail server or connection to a mail server were compromised, an attacker could cause the parser to malfunction, potentially crashing Thunderbird or leaking sensitive data." ],
  "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" : "2026-04-01T00:00:00Z",
    "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" : "2026-04-15T00:00:00Z",
    "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 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" : "2026-04-15T00:00:00Z",
    "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" : "2026-04-20T00:00:00Z",
    "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" : "2026-04-20T00:00:00Z",
    "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" : "2026-04-15T00:00:00Z",
    "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" : "2026-04-15T00:00:00Z",
    "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" : "2026-04-15T00:00:00Z",
    "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" : "2026-04-15T00:00:00Z",
    "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" : "2026-04-15T00:00:00Z",
    "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" : "2026-03-30T00:00:00Z",
    "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" : "2026-04-15T00:00:00Z",
    "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" : "2026-04-15T00:00:00Z",
    "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" : "2026-04-15T00:00:00Z",
    "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" : "2026-04-15T00:00:00Z",
    "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/thunderbird-flatpak",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10"
  }, {
    "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-2026-4371\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-4371\nhttps://www.mozilla.org/security/advisories/mfsa2026-24/#CVE-2026-4371" ],
  "name" : "CVE-2026-4371",
  "mitigation" : {
    "value" : "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.",
    "lang" : "en:us"
  },
  "csaw" : false
}