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OESA-2026-1994 (CVE-2025-59375)

Vulnerability from osv_openeuler – Published: 2026-04-17 11:10 – Updated: 2026-08-06 11:10 – Source website
VLAI
Summary
thunderbird security update
Details

Mozilla Thunderbird is a standalone mail and newsgroup client.

Security Fix(es):

libexpat in Expat before 2.7.2 allows attackers to trigger large dynamic memory allocations via a small document that is submitted for parsing.(CVE-2025-59375)

Spoofing issue in Thunderbird. This vulnerability was fixed in Thunderbird 149 and Thunderbird 140.9.(CVE-2026-3889)

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.(CVE-2026-4371)

Race condition, use-after-free in the Graphics: WebRender component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4684)

Incorrect boundary conditions in the Graphics: Canvas2D component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4685)

Incorrect boundary conditions in the Graphics: Canvas2D component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4686)

Sandbox escape due to incorrect boundary conditions in the Telemetry component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4687)

Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4688)

Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4689)

Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.(CVE-2026-4690)

Use-after-free in the CSS Parsing and Computation component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4691)

Sandbox escape in the Responsive Design Mode component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.(CVE-2026-4692)

Incorrect boundary conditions in the Audio/Video: Playback component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4693)

Incorrect boundary conditions, integer overflow in the Graphics component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.(CVE-2026-4694)

Incorrect boundary conditions in the Audio/Video: Web Codecs component. This vulnerability affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4695)

Use-after-free in the Layout: Text and Fonts component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4696)

Incorrect boundary conditions in the Audio/Video: Web Codecs component. This vulnerability affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4697)

JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4698)

Incorrect boundary conditions in the Layout: Text and Fonts component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4699)

Mitigation bypass in the Networking: HTTP component. This vulnerability affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4700)

Use-after-free in the JavaScript Engine component. This vulnerability affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4701)

JIT miscompilation in the JavaScript Engine component. This vulnerability affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4702)

Denial-of-service in the WebRTC: Signaling component. This vulnerability affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4704)

Undefined behavior in the WebRTC: Signaling component. This vulnerability affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4705)

Incorrect boundary conditions in the Graphics: Canvas2D component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4706)

Incorrect boundary conditions in the Graphics: Canvas2D component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4707)

Incorrect boundary conditions in the Graphics component. This vulnerability affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4708)

Incorrect boundary conditions in the Audio/Video: GMP component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4709)

Incorrect boundary conditions in the Audio/Video component. This vulnerability affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4710)

Use-after-free in the Widget: Cocoa component. This vulnerability affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4711)

Information disclosure in the Widget: Cocoa component. This vulnerability affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4712)

Incorrect boundary conditions in the Graphics component. This vulnerability affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4713)

Incorrect boundary conditions in the Audio/Video component. This vulnerability affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4714)

Uninitialized memory in the Graphics: Canvas2D component. This vulnerability affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4715)

Incorrect boundary conditions, uninitialized memory in the JavaScript Engine component. This vulnerability affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4716)

Privilege escalation in the Netmonitor component. This vulnerability affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4717)

Undefined behavior in the WebRTC: Signaling component. This vulnerability affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4718)

Incorrect boundary conditions in the Graphics: Text component. This vulnerability affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.(CVE-2026-4719)

Memory safety bugs present in Firefox ESR 140.8, Thunderbird ESR 140.8, Firefox 148 and Thunderbird 148. 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. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.(CVE-2026-4720)

Memory safety bugs present in Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird ESR 140.8, Firefox 148 and Thunderbird 148. 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. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.(CVE-2026-4721)

References
https://www.openeuler.org/zh/security/security-bu… ADVISORY
https://nvd.nist.gov/vuln/detail/CVE-2025-59375 ADVISORY
https://nvd.nist.gov/vuln/detail/CVE-2026-3889 ADVISORY
https://nvd.nist.gov/vuln/detail/CVE-2026-4371 ADVISORY
https://nvd.nist.gov/vuln/detail/CVE-2026-4684 ADVISORY
https://nvd.nist.gov/vuln/detail/CVE-2026-4685 ADVISORY
https://nvd.nist.gov/vuln/detail/CVE-2026-4686 ADVISORY
https://nvd.nist.gov/vuln/detail/CVE-2026-4687 ADVISORY
https://nvd.nist.gov/vuln/detail/CVE-2026-4688 ADVISORY
https://nvd.nist.gov/vuln/detail/CVE-2026-4689 ADVISORY
https://nvd.nist.gov/vuln/detail/CVE-2026-4690 ADVISORY
https://nvd.nist.gov/vuln/detail/CVE-2026-4691 ADVISORY
https://nvd.nist.gov/vuln/detail/CVE-2026-4692 ADVISORY
https://nvd.nist.gov/vuln/detail/CVE-2026-4693 ADVISORY
https://nvd.nist.gov/vuln/detail/CVE-2026-4694 ADVISORY
https://nvd.nist.gov/vuln/detail/CVE-2026-4695 ADVISORY
https://nvd.nist.gov/vuln/detail/CVE-2026-4696 ADVISORY
https://nvd.nist.gov/vuln/detail/CVE-2026-4697 ADVISORY
https://nvd.nist.gov/vuln/detail/CVE-2026-4698 ADVISORY
https://nvd.nist.gov/vuln/detail/CVE-2026-4699 ADVISORY
https://nvd.nist.gov/vuln/detail/CVE-2026-4700 ADVISORY
https://nvd.nist.gov/vuln/detail/CVE-2026-4701 ADVISORY
https://nvd.nist.gov/vuln/detail/CVE-2026-4702 ADVISORY
https://nvd.nist.gov/vuln/detail/CVE-2026-4704 ADVISORY
https://nvd.nist.gov/vuln/detail/CVE-2026-4705 ADVISORY
https://nvd.nist.gov/vuln/detail/CVE-2026-4706 ADVISORY
https://nvd.nist.gov/vuln/detail/CVE-2026-4707 ADVISORY
https://nvd.nist.gov/vuln/detail/CVE-2026-4708 ADVISORY
https://nvd.nist.gov/vuln/detail/CVE-2026-4709 ADVISORY
https://nvd.nist.gov/vuln/detail/CVE-2026-4710 ADVISORY
https://nvd.nist.gov/vuln/detail/CVE-2026-4711 ADVISORY
https://nvd.nist.gov/vuln/detail/CVE-2026-4712 ADVISORY
https://nvd.nist.gov/vuln/detail/CVE-2026-4713 ADVISORY
https://nvd.nist.gov/vuln/detail/CVE-2026-4714 ADVISORY
https://nvd.nist.gov/vuln/detail/CVE-2026-4715 ADVISORY
https://nvd.nist.gov/vuln/detail/CVE-2026-4716 ADVISORY
https://nvd.nist.gov/vuln/detail/CVE-2026-4717 ADVISORY
https://nvd.nist.gov/vuln/detail/CVE-2026-4718 ADVISORY
https://nvd.nist.gov/vuln/detail/CVE-2026-4719 ADVISORY
https://nvd.nist.gov/vuln/detail/CVE-2026-4720 ADVISORY
https://nvd.nist.gov/vuln/detail/CVE-2026-4721 ADVISORY

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "thunderbird-140.9.1-1.oe2403sp3.aarch64.rpm",
          "thunderbird-debuginfo-140.9.1-1.oe2403sp3.aarch64.rpm",
          "thunderbird-debugsource-140.9.1-1.oe2403sp3.aarch64.rpm",
          "thunderbird-librnp-rnp-140.9.1-1.oe2403sp3.aarch64.rpm",
          "thunderbird-wayland-140.9.1-1.oe2403sp3.aarch64.rpm"
        ],
        "src": [
          "thunderbird-140.9.1-1.oe2403sp3.src.rpm"
        ],
        "x86_64": [
          "thunderbird-140.9.1-1.oe2403sp3.x86_64.rpm",
          "thunderbird-debuginfo-140.9.1-1.oe2403sp3.x86_64.rpm",
          "thunderbird-debugsource-140.9.1-1.oe2403sp3.x86_64.rpm",
          "thunderbird-librnp-rnp-140.9.1-1.oe2403sp3.x86_64.rpm",
          "thunderbird-wayland-140.9.1-1.oe2403sp3.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS-SP3",
        "name": "thunderbird",
        "purl": "pkg:rpm/openEuler/thunderbird\u0026distro=openEuler-24.03-LTS-SP3"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "140.9.1-1.oe2403sp3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "Critical"
  },
  "details": "Mozilla Thunderbird is a standalone mail and newsgroup client.\r\n\r\nSecurity Fix(es):\n\nlibexpat in Expat before 2.7.2 allows attackers to trigger large dynamic memory allocations via a small document that is submitted for parsing.(CVE-2025-59375)\n\nSpoofing issue in Thunderbird. This vulnerability was fixed in Thunderbird 149 and Thunderbird 140.9.(CVE-2026-3889)\n\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. This vulnerability was fixed in Thunderbird 149 and Thunderbird 140.9.(CVE-2026-4371)\n\nRace condition, use-after-free in the Graphics: WebRender component. This vulnerability affects Firefox \u0026lt; 149, Firefox ESR \u0026lt; 115.34, Firefox ESR \u0026lt; 140.9, Thunderbird \u0026lt; 149, and Thunderbird \u0026lt; 140.9.(CVE-2026-4684)\n\nIncorrect boundary conditions in the Graphics: Canvas2D component. This vulnerability affects Firefox \u0026lt; 149, Firefox ESR \u0026lt; 115.34, Firefox ESR \u0026lt; 140.9, Thunderbird \u0026lt; 149, and Thunderbird \u0026lt; 140.9.(CVE-2026-4685)\n\nIncorrect boundary conditions in the Graphics: Canvas2D component. This vulnerability affects Firefox \u0026lt; 149, Firefox ESR \u0026lt; 115.34, Firefox ESR \u0026lt; 140.9, Thunderbird \u0026lt; 149, and Thunderbird \u0026lt; 140.9.(CVE-2026-4686)\n\nSandbox escape due to incorrect boundary conditions in the Telemetry component. This vulnerability affects Firefox \u0026lt; 149, Firefox ESR \u0026lt; 115.34, Firefox ESR \u0026lt; 140.9, Thunderbird \u0026lt; 149, and Thunderbird \u0026lt; 140.9.(CVE-2026-4687)\n\nSandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability affects Firefox \u0026lt; 149, Firefox ESR \u0026lt; 140.9, Thunderbird \u0026lt; 149, and Thunderbird \u0026lt; 140.9.(CVE-2026-4688)\n\nSandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component. This vulnerability affects Firefox \u0026lt; 149, Firefox ESR \u0026lt; 115.34, Firefox ESR \u0026lt; 140.9, Thunderbird \u0026lt; 149, and Thunderbird \u0026lt; 140.9.(CVE-2026-4689)\n\nSandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.(CVE-2026-4690)\n\nUse-after-free in the CSS Parsing and Computation component. This vulnerability affects Firefox \u0026lt; 149, Firefox ESR \u0026lt; 115.34, Firefox ESR \u0026lt; 140.9, Thunderbird \u0026lt; 149, and Thunderbird \u0026lt; 140.9.(CVE-2026-4691)\n\nSandbox escape in the Responsive Design Mode component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.(CVE-2026-4692)\n\nIncorrect boundary conditions in the Audio/Video: Playback component. This vulnerability affects Firefox \u0026lt; 149, Firefox ESR \u0026lt; 115.34, Firefox ESR \u0026lt; 140.9, Thunderbird \u0026lt; 149, and Thunderbird \u0026lt; 140.9.(CVE-2026-4693)\n\nIncorrect boundary conditions, integer overflow in the Graphics component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.(CVE-2026-4694)\n\nIncorrect boundary conditions in the Audio/Video: Web Codecs component. This vulnerability affects Firefox \u0026lt; 149, Firefox ESR \u0026lt; 140.9, Thunderbird \u0026lt; 149, and Thunderbird \u0026lt; 140.9.(CVE-2026-4695)\n\nUse-after-free in the Layout: Text and Fonts component. This vulnerability affects Firefox \u0026lt; 149, Firefox ESR \u0026lt; 115.34, Firefox ESR \u0026lt; 140.9, Thunderbird \u0026lt; 149, and Thunderbird \u0026lt; 140.9.(CVE-2026-4696)\n\nIncorrect boundary conditions in the Audio/Video: Web Codecs component. This vulnerability affects Firefox \u0026lt; 149, Firefox ESR \u0026lt; 140.9, Thunderbird \u0026lt; 149, and Thunderbird \u0026lt; 140.9.(CVE-2026-4697)\n\nJIT miscompilation in the JavaScript Engine: JIT component. This vulnerability affects Firefox \u0026lt; 149, Firefox ESR \u0026lt; 115.34, Firefox ESR \u0026lt; 140.9, Thunderbird \u0026lt; 149, and Thunderbird \u0026lt; 140.9.(CVE-2026-4698)\n\nIncorrect boundary conditions in the Layout: Text and Fonts component. This vulnerability affects Firefox \u0026lt; 149, Firefox ESR \u0026lt; 115.34, Firefox ESR \u0026lt; 140.9, Thunderbird \u0026lt; 149, and Thunderbird \u0026lt; 140.9.(CVE-2026-4699)\n\nMitigation bypass in the Networking: HTTP component. This vulnerability affects Firefox \u0026lt; 149, Firefox ESR \u0026lt; 140.9, Thunderbird \u0026lt; 149, and Thunderbird \u0026lt; 140.9.(CVE-2026-4700)\n\nUse-after-free in the JavaScript Engine component. This vulnerability affects Firefox \u0026lt; 149, Firefox ESR \u0026lt; 140.9, Thunderbird \u0026lt; 149, and Thunderbird \u0026lt; 140.9.(CVE-2026-4701)\n\nJIT miscompilation in the JavaScript Engine component. This vulnerability affects Firefox \u0026lt; 149, Firefox ESR \u0026lt; 140.9, Thunderbird \u0026lt; 149, and Thunderbird \u0026lt; 140.9.(CVE-2026-4702)\n\nDenial-of-service in the WebRTC: Signaling component. This vulnerability affects Firefox \u0026lt; 149, Firefox ESR \u0026lt; 140.9, Thunderbird \u0026lt; 149, and Thunderbird \u0026lt; 140.9.(CVE-2026-4704)\n\nUndefined behavior in the WebRTC: Signaling component. This vulnerability affects Firefox \u0026lt; 149, Firefox ESR \u0026lt; 140.9, Thunderbird \u0026lt; 149, and Thunderbird \u0026lt; 140.9.(CVE-2026-4705)\n\nIncorrect boundary conditions in the Graphics: Canvas2D component. This vulnerability affects Firefox \u0026lt; 149, Firefox ESR \u0026lt; 115.34, Firefox ESR \u0026lt; 140.9, Thunderbird \u0026lt; 149, and Thunderbird \u0026lt; 140.9.(CVE-2026-4706)\n\nIncorrect boundary conditions in the Graphics: Canvas2D component. This vulnerability affects Firefox \u0026lt; 149, Firefox ESR \u0026lt; 115.34, Firefox ESR \u0026lt; 140.9, Thunderbird \u0026lt; 149, and Thunderbird \u0026lt; 140.9.(CVE-2026-4707)\n\nIncorrect boundary conditions in the Graphics component. This vulnerability affects Firefox \u0026lt; 149, Firefox ESR \u0026lt; 140.9, Thunderbird \u0026lt; 149, and Thunderbird \u0026lt; 140.9.(CVE-2026-4708)\n\nIncorrect boundary conditions in the Audio/Video: GMP component. This vulnerability affects Firefox \u0026lt; 149, Firefox ESR \u0026lt; 115.34, Firefox ESR \u0026lt; 140.9, Thunderbird \u0026lt; 149, and Thunderbird \u0026lt; 140.9.(CVE-2026-4709)\n\nIncorrect boundary conditions in the Audio/Video component. This vulnerability affects Firefox \u0026lt; 149, Firefox ESR \u0026lt; 140.9, Thunderbird \u0026lt; 149, and Thunderbird \u0026lt; 140.9.(CVE-2026-4710)\n\nUse-after-free in the Widget: Cocoa component. This vulnerability affects Firefox \u0026lt; 149, Firefox ESR \u0026lt; 140.9, Thunderbird \u0026lt; 149, and Thunderbird \u0026lt; 140.9.(CVE-2026-4711)\n\nInformation disclosure in the Widget: Cocoa component. This vulnerability affects Firefox \u0026lt; 149, Firefox ESR \u0026lt; 140.9, Thunderbird \u0026lt; 149, and Thunderbird \u0026lt; 140.9.(CVE-2026-4712)\n\nIncorrect boundary conditions in the Graphics component. This vulnerability affects Firefox \u0026lt; 149, Firefox ESR \u0026lt; 140.9, Thunderbird \u0026lt; 149, and Thunderbird \u0026lt; 140.9.(CVE-2026-4713)\n\nIncorrect boundary conditions in the Audio/Video component. This vulnerability affects Firefox \u0026lt; 149, Firefox ESR \u0026lt; 140.9, Thunderbird \u0026lt; 149, and Thunderbird \u0026lt; 140.9.(CVE-2026-4714)\n\nUninitialized memory in the Graphics: Canvas2D component. This vulnerability affects Firefox \u0026lt; 149, Firefox ESR \u0026lt; 140.9, Thunderbird \u0026lt; 149, and Thunderbird \u0026lt; 140.9.(CVE-2026-4715)\n\nIncorrect boundary conditions, uninitialized memory in the JavaScript Engine component. This vulnerability affects Firefox \u0026lt; 149, Firefox ESR \u0026lt; 140.9, Thunderbird \u0026lt; 149, and Thunderbird \u0026lt; 140.9.(CVE-2026-4716)\n\nPrivilege escalation in the Netmonitor component. This vulnerability affects Firefox \u0026lt; 149, Firefox ESR \u0026lt; 140.9, Thunderbird \u0026lt; 149, and Thunderbird \u0026lt; 140.9.(CVE-2026-4717)\n\nUndefined behavior in the WebRTC: Signaling component. This vulnerability affects Firefox \u0026lt; 149, Firefox ESR \u0026lt; 140.9, Thunderbird \u0026lt; 149, and Thunderbird \u0026lt; 140.9.(CVE-2026-4718)\n\nIncorrect boundary conditions in the Graphics: Text component. This vulnerability affects Firefox \u0026lt; 149, Firefox ESR \u0026lt; 140.9, Thunderbird \u0026lt; 149, and Thunderbird \u0026lt; 140.9.(CVE-2026-4719)\n\nMemory safety bugs present in Firefox ESR 140.8, Thunderbird ESR 140.8, Firefox 148 and Thunderbird 148. 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. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.(CVE-2026-4720)\n\nMemory safety bugs present in Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird ESR 140.8, Firefox 148 and Thunderbird 148. 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. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.(CVE-2026-4721)",
  "id": "OESA-2026-1994",
  "modified": "2026-08-06T11:10:59Z",
  "published": "2026-04-17T11:10:59Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-1994"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-59375"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-3889"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4371"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4684"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4685"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4686"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4687"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4688"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4689"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4690"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4691"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4692"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4693"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4694"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4695"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4696"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4697"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4698"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4699"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4700"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4701"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4702"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4704"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4705"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4706"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4707"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4708"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4709"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4710"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4711"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4712"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4713"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4714"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4715"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4716"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4717"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4718"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4719"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4720"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4721"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "thunderbird security update",
  "upstream": [
    "CVE-2025-59375",
    "CVE-2026-3889",
    "CVE-2026-4371",
    "CVE-2026-4684",
    "CVE-2026-4685",
    "CVE-2026-4686",
    "CVE-2026-4687",
    "CVE-2026-4688",
    "CVE-2026-4689",
    "CVE-2026-4690",
    "CVE-2026-4691",
    "CVE-2026-4692",
    "CVE-2026-4693",
    "CVE-2026-4694",
    "CVE-2026-4695",
    "CVE-2026-4696",
    "CVE-2026-4697",
    "CVE-2026-4698",
    "CVE-2026-4699",
    "CVE-2026-4700",
    "CVE-2026-4701",
    "CVE-2026-4702",
    "CVE-2026-4704",
    "CVE-2026-4705",
    "CVE-2026-4706",
    "CVE-2026-4707",
    "CVE-2026-4708",
    "CVE-2026-4709",
    "CVE-2026-4710",
    "CVE-2026-4711",
    "CVE-2026-4712",
    "CVE-2026-4713",
    "CVE-2026-4714",
    "CVE-2026-4715",
    "CVE-2026-4716",
    "CVE-2026-4717",
    "CVE-2026-4718",
    "CVE-2026-4719",
    "CVE-2026-4720",
    "CVE-2026-4721"
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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Detection rules are retrieved from Rulezet.

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Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.


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