{
  "cveId": "CVE-2026-103500",
  "url": "https://patchblox.com/security/cve/CVE-2026-103500",
  "summary": "CVE-2026-103500 is fixed in 135 products on 3 platforms, first by Mozilla Thunderbird 157.0, released September 28, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "Heap buffer overflow opening large email",
  "description": "An attacker could cause a heap buffer overflow by getting a user to open an email that is greater than or equal to 2GB in size. This vulnerability was fixed in Thunderbird 157, Thunderbird 140.17, and Thunderbird 153.4.",
  "published": "2026-09-30T18:18:18Z",
  "severity": "medium",
  "cvss": 6.1,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H",
  "cwe": "CWE-122: Heap-based Buffer Overflow",
  "epss": 0.00277,
  "epssPercentile": 0.20262,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://nvd.nist.gov/vuln/detail/CVE-2026-103500",
  "fixes": [
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (af)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (af) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.af-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (ar)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (ar) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.ar-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (ast)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (ast) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.ast-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (be)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (be) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.be-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (bg)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (bg) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.bg-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (br)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (br) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.br-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (ca)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (ca) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.ca-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (cak)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (cak) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.cak-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (cs)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (cs) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.cs-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (cy)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (cy) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.cy-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (da)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (da) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.da-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (de)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (de) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.de-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (dsb)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (dsb) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.dsb-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (el)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (el) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.el-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (en-CA)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (en-CA) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.en-ca-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (en-GB)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (en-GB) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.en-gb-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (en-US)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (en-US) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (es-AR)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (es-AR) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.es-ar-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (es-ES)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (es-ES) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.es-es-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (es-MX)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (es-MX) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.es-mx-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (et)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (et) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.et-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (eu)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (eu) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.eu-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (fi)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (fi) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.fi-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (fr)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (fr) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.fr-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (fy-NL)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (fy-NL) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.fy-nl-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (ga-IE)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (ga-IE) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.ga-ie-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (gd)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (gd) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.gd-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (gl)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (gl) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.gl-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (he)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (he) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.he-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (hr)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (hr) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.hr-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (hsb)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (hsb) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.hsb-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (hu)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (hu) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.hu-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (hy-AM)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (hy-AM) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.hy-am-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (id)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (id) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.id-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (is)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (is) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.is-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (it)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (it) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.it-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (ja)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (ja) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.ja-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (ka)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (ka) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.ka-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (kab)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (kab) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.kab-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (kk)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (kk) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.kk-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (ko)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (ko) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.ko-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (lt)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (lt) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.lt-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (lv)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (lv) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.lv-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (ms)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (ms) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.ms-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (nb-NO)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (nb-NO) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.nb-no-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (nl)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (nl) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.nl-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (nn-NO)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (nn-NO) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.nn-no-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (pa-IN)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (pa-IN) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.pa-in-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (pl)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (pl) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.pl-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (pt-BR)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (pt-BR) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.pt-br-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (pt-PT)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (pt-PT) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.pt-pt-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (rm)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (rm) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.rm-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (ro)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (ro) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.ro-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (ru)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (ru) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.ru-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (sk)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (sk) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.sk-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (sl)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (sl) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.sl-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (sq)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (sq) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.sq-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (sr)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (sr) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.sr-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (sv-SE)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (sv-SE) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.sv-se-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (th)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (th) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.th-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (tr)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (tr) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.tr-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (uk)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (uk) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.uk-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
      "product": "Mozilla Thunderbird (uz)",
      "fixedVersion": "157.0",
      "fix": "Mozilla Thunderbird (uz) 157.0",
      "url": "https://patchblox.com/security/fix/windows-app/mozilla.thunderbird.uz-157.0",
      "released": "2026-09-30T00:00:00Z"
    },
    {
      "platform": "windows-app",
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  "dataAsOf": "2026-11-09T13:31:49Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}