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      "text" : "An update for thunderbird is now available for Red Hat Enterprise Linux 9.\n\nRed Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.",
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      "text" : "Mozilla Thunderbird is a standalone mail and newsgroup client.\n\nSecurity Fix(es):\n\n* firefox: Spoofing issue in the Downloads Panel component (CVE-2025-14327)\n\n* firefox: Use-after-free in the JavaScript: GC component (CVE-2026-0885)\n\n* firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 140.7, Thunderbird ESR 140.7, Firefox 147 and Thunderbird 147 (CVE-2026-0891)\n\n* firefox: Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component (CVE-2026-0878)\n\n* firefox: Use-after-free in the IPC component (CVE-2026-0882)\n\n* firefox: Use-after-free in the JavaScript Engine component (CVE-2026-0884)\n\n* firefox: Information disclosure in the Networking component (CVE-2026-0883)\n\n* firefox: Mitigation bypass in the DOM: Security component (CVE-2026-0877)\n\n* firefox: Spoofing issue in the DOM: Copy & Paste and Drag & Drop component (CVE-2026-0890)\n\n* firefox: Clickjacking issue, information disclosure in the PDF Viewer component (CVE-2026-0887)\n\n* firefox: Sandbox escape due to incorrect boundary conditions in the Graphics component (CVE-2026-0879)\n\n* firefox: Sandbox escape due to integer overflow in the Graphics component (CVE-2026-0880)\n\n* firefox: Incorrect boundary conditions in the Graphics component (CVE-2026-0886)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.",
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      "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-0890"
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      "category" : "external",
      "summary" : "https://www.mozilla.org/security/advisories/mfsa2026-03/#CVE-2026-0890",
      "url" : "https://www.mozilla.org/security/advisories/mfsa2026-03/#CVE-2026-0890"
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    "cve" : "CVE-2026-0891",
    "discovery_date" : "2026-01-13T14:01:25.941404+00:00",
    "ids" : [ {
      "system_name" : "Red Hat Bugzilla ID",
      "text" : "2428963"
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      "category" : "description",
      "text" : "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 140.6, Thunderbird ESR 140.6, Firefox 146 and Thunderbird 146. 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.",
      "title" : "Vulnerability description"
    }, {
      "category" : "summary",
      "text" : "firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 140.7, Thunderbird ESR 140.7, Firefox 147 and Thunderbird 147",
      "title" : "Vulnerability summary"
    }, {
      "category" : "other",
      "text" : "Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.",
      "title" : "Statement"
    }, {
      "category" : "general",
      "text" : "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
      "title" : "CVSS score applicability"
    } ],
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      "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-0891"
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      "url" : "https://www.mozilla.org/security/advisories/mfsa2026-03/#CVE-2026-0891"
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}