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thunderbird vulnerabilities · Page 23

Vulnerabilities published for thunderbird in the last 30 days: 258. Listed in the KEV catalogue: 0.

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Vulnerabilities: 1318

  1. CVE-2026-6749

    High · CVSS 7.5EPSS 0.4%Fix available

    Information disclosure due to uninitialized memory in the Graphics: Canvas2D component

    Information disclosure due to uninitialized memory in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

    • Update to 1:140.10.0esr-1~deb12u1
    Published Updated
  2. CVE-2026-5734

    High · CVSS 8.1EPSS 0.33%Fix available

    Memory safety bugs fixed in Firefox ESR 140.9.1, Thunderbird ESR 140.9.1, Firefox 149.0.2 and Thunderbird 149.0.2

    Memory safety bugs present in Firefox ESR 140.9.0, Thunderbird ESR 140.9.0, Firefox 149.0.1 and Thunderbird 149.0.1. 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 149.0.2, Firefox ESR 140.9.1, Thunderbird 149.0.2, and Thunderbird 140.9.1.

    • Update to 1:140.9.1esr-1~deb12u1
    Published Updated
  3. CVE-2026-5731

    Critical · CVSS 9.8EPSS 0.34%Fix available

    Memory safety bugs fixed in Firefox ESR 115.34.1, Firefox ESR 140.9.1, Thunderbird ESR 140.9.1, Firefox 149.0.2 and Thunderbird 149.0.2

    Memory safety bugs present in Firefox ESR 115.34.0, Firefox ESR 140.9.0, Thunderbird ESR 140.9.0, Firefox 149.0.1 and Thunderbird 149.0.1. 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 149.0.2, Firefox ESR 115.34.1, Firefox ESR 140.9.1, Thunderbird 149.0.2, and Thunderbird 140.9.1.

    • Update to 1:140.9.1esr-1~deb12u1
    Published Updated
  4. CVE-2026-4371

    High · CVSS 7.4EPSS 0.37%Fix available

    Out of bounds read in IMAP parsing

    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.

    • Update to 1:140.9.0esr-1~deb12u1
    Published Updated
  5. CVE-2026-4721

    Critical · CVSS 9.8EPSS 0.44%Fix available

    Memory safety bugs fixed in Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149

    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.

    • Update to 1:140.9.0esr-1~deb12u1
    Published Updated
  6. CVE-2026-4720

    Critical · CVSS 9.8EPSS 0.44%Fix available

    Memory safety bugs fixed in Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149

    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.

    • Update to 1:140.9.0esr-1~deb12u1
    Published Updated
  7. CVE-2026-4716

    Critical · CVSS 9.1EPSS 0.42%Fix available

    Incorrect boundary conditions, uninitialized memory in the JavaScript Engine component

    Incorrect boundary conditions, uninitialized memory in the JavaScript Engine component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

    • Update to 1:140.9.0esr-1~deb12u1
    Published Updated

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