{
  "cveId": "CVE-2026-4371",
  "url": "https://patchblox.com/security/cve/CVE-2026-4371",
  "summary": "CVE-2026-4371 is fixed in 134 products on 2 platforms, first by Mozilla Thunderbird (af) 149.0, released March 24, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "Out of bounds read in IMAP parsing",
  "description": "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.",
  "published": "2026-03-24T20:27:15Z",
  "severity": "Important",
  "cvss": 8.2,
  "cvssVector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H",
  "cwe": "CWE-126: Buffer Over-read",
  "epss": 0.00367,
  "epssPercentile": 0.30726,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://nvd.nist.gov/vuln/detail/CVE-2026-4371",
  "fixes": [
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (af)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (af) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.af-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (ar)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (ar) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.ar-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (ast)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (ast) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.ast-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (be)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (be) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.be-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (bg)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (bg) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.bg-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (br)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (br) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.br-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (ca)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (ca) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.ca-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (cak)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (cak) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.cak-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (cs)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (cs) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.cs-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (cy)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (cy) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.cy-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (da)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (da) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.da-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (de)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (de) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.de-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (dsb)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (dsb) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.dsb-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (el)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (el) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.el-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (en-CA)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (en-CA) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.en-ca-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (en-GB)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (en-GB) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.en-gb-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (en-US)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (en-US) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (es-AR)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (es-AR) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.es-ar-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (es-ES)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (es-ES) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.es-es-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (es-MX)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (es-MX) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.es-mx-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (et)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (et) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.et-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (eu)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (eu) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.eu-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (fi)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (fi) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.fi-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (fr)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (fr) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.fr-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (fy-NL)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (fy-NL) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.fy-nl-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (ga-IE)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (ga-IE) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.ga-ie-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (gd)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (gd) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.gd-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (gl)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (gl) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.gl-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (he)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (he) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.he-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (hr)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (hr) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.hr-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (hsb)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (hsb) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.hsb-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (hu)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (hu) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.hu-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (hy-AM)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (hy-AM) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.hy-am-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (id)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (id) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.id-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (is)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (is) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.is-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (it)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (it) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.it-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (ja)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (ja) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.ja-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (ka)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (ka) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.ka-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (kab)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (kab) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.kab-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (kk)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (kk) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.kk-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (ko)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (ko) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.ko-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (lt)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (lt) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.lt-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (lv)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (lv) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.lv-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (ms)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (ms) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.ms-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (nb-NO)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (nb-NO) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.nb-no-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (nl)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (nl) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.nl-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (nn-NO)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (nn-NO) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.nn-no-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (pa-IN)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (pa-IN) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.pa-in-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (pl)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (pl) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.pl-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (pt-BR)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (pt-BR) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.pt-br-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (pt-PT)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (pt-PT) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.pt-pt-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (rm)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (rm) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.rm-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (ro)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (ro) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.ro-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (ru)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (ru) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.ru-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (sk)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (sk) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.sk-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (sl)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (sl) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.sl-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (sq)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (sq) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.sq-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (sr)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (sr) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.sr-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (sv-SE)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (sv-SE) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.sv-se-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (th)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (th) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.th-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (tr)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (tr) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.tr-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (uk)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (uk) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.uk-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (uz)",
      "fixedVersion": "149.0",
      "fix": "Mozilla Thunderbird (uz) 149.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.uz-149.0",
      "released": "2026-03-24T00:00:00Z"
    },
    {
      "platform": "windows-app",
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  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}