{
  "cveId": "CVE-2026-14899",
  "url": "https://patchblox.com/security/cve/CVE-2026-14899",
  "summary": "CVE-2026-14899 is fixed in 134 products on 2 platforms, first by Mozilla Thunderbird (af) 141.0, released July 22, 2025. It is not reported as exploited. Patch Radar priority: High.",
  "title": "Off-by-one out of bounds read in MIME header parser for forwarding",
  "description": "The code to parse MIME headers for display when forwarding a message (if the setting to view all headers was enabled) had an off-by-one error, allowing a single byte to be read from the memory after the buffer for the headers, and potentially crashing Thunderbird. This vulnerability was fixed in Thunderbird 153 and Thunderbird 140.13.",
  "published": "2026-07-22T19:19:42Z",
  "severity": "moderate",
  "cvss": 8.8,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
  "cwe": "CWE-193: Off-by-one Error",
  "epss": 0.00469,
  "epssPercentile": 0.40814,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://nvd.nist.gov/vuln/detail/CVE-2026-14899",
  "fixes": [
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (af)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (af) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.af-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (ar)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (ar) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.ar-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (ast)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (ast) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.ast-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (be)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (be) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.be-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (bg)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (bg) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.bg-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (br)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (br) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.br-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (ca)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (ca) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.ca-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (cak)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (cak) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.cak-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (cs)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (cs) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.cs-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (cy)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (cy) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.cy-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (da)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (da) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.da-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (de)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (de) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.de-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (dsb)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (dsb) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.dsb-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (el)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (el) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.el-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (en-CA)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (en-CA) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.en-ca-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (en-GB)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (en-GB) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.en-gb-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (en-US)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (en-US) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (es-AR)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (es-AR) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.es-ar-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (es-ES)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (es-ES) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.es-es-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (es-MX)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (es-MX) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.es-mx-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (et)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (et) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.et-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (eu)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (eu) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.eu-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (fi)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (fi) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.fi-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (fr)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (fr) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.fr-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (fy-NL)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (fy-NL) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.fy-nl-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (ga-IE)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (ga-IE) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.ga-ie-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (gd)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (gd) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.gd-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (gl)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (gl) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.gl-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (he)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (he) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.he-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (hr)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (hr) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.hr-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (hsb)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (hsb) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.hsb-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (hu)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (hu) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.hu-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (hy-AM)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (hy-AM) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.hy-am-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (id)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (id) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.id-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (is)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (is) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.is-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (it)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (it) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.it-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (ja)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (ja) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.ja-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (ka)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (ka) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.ka-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (kab)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (kab) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.kab-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (kk)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (kk) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.kk-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (ko)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (ko) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.ko-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (lt)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (lt) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.lt-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (lv)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (lv) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.lv-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (ms)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (ms) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.ms-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (nb-NO)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (nb-NO) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.nb-no-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (nl)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (nl) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.nl-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (nn-NO)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (nn-NO) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.nn-no-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (pa-IN)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (pa-IN) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.pa-in-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (pl)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (pl) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.pl-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (pt-BR)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (pt-BR) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.pt-br-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (pt-PT)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (pt-PT) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.pt-pt-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (rm)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (rm) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.rm-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (ro)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (ro) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.ro-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (ru)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (ru) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.ru-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (sk)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (sk) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.sk-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (sl)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (sl) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.sl-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (sq)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (sq) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.sq-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (sr)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (sr) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.sr-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (sv-SE)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (sv-SE) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.sv-se-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (th)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (th) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.th-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (tr)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (tr) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.tr-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (uk)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (uk) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.uk-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (uz)",
      "fixedVersion": "141.0",
      "fix": "Mozilla Thunderbird (uz) 141.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.uz-141.0",
      "released": "2025-07-22T00:00:00Z"
    },
    {
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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"
  }
}