A double-free could have occurred in `vpx_codec_enc_init_multi` after a failed allocation when initializing the encoder for WebRTC. This could have caused memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 139 and Thunderbird < 128.11.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - A double-free could have occurred in `vpx_codec_enc_init_multi` after a failed allocation when     initializing the encoder for WebRTC. This could have caused memory corruption and a potentially     exploitable crash. This vulnerability affects Thunderbird < 139 and Thunderbird < 128.11. (CVE-2025-5262)

Note that Nessus relies on the presence of the package as reported by the vendor.

The remote Fedora 43 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2025-8d38482143 advisory.

    Automatic update for libvpx-1.15.0-3.fc43.

    ##### **Changelog**

    ```
    * Tue Jun  3 2025 Wim Taymans <wtaymans@redhat.com> - 1.15.0-3
    - Add patch for double free       Resolves: rhbz#2368931

    ```

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Fedora 42 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2025-a52491bdd9 advisory.

    Update to 128.11.0

    * https://www.thunderbird.net/en-US/thunderbird/128.11.0esr/releasenotes/
    * https://www.mozilla.org/en-US/security/advisories/mfsa2025-46/

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 / openSUSE 15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2025:01946-1 advisory.

    Update to Mozilla Thunderbird 128.11 (MFSA 2025-46, bsc#1243353):

    - CVE-2025-5262: Double-free in libvpx encoder (bmo#1962421)
    - CVE-2025-5263: Error handling for script execution was incorrectly isolated from web content     (bmo#1960745)
    - CVE-2025-5264: Potential local code execution in 'Copy as cURL' command (bmo#1950001)
    - CVE-2025-5265: Potential local code execution in 'Copy as cURL' command (bmo#1962301)
    - CVE-2025-5266: Script element events leaked cross-origin resource status (bmo#1965628)
    - CVE-2025-5267: Clickjacking vulnerability could have led to leaking saved payment card details     (bmo#1954137)
    - CVE-2025-5268: Memory safety bugs fixed in Firefox 139, Thunderbird 139, Firefox ESR 128.11, and     Thunderbird 128.11 (bmo#1950136, bmo#1958121, bmo#1960499, bmo#1962634)
    - CVE-2025-5269: Memory safety bug fixed in Firefox ESR 128.11 and Thunderbird 128.11 (bmo#1924108)

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 41 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2025-15220f1411 advisory.

    Add patch for double free

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Fedora 42 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2025-f5bf0fb721 advisory.

    Add patch for double free

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Fedora 41 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2025-5bf1989d48 advisory.

    Update to 128.11.0

    * https://www.thunderbird.net/en-US/thunderbird/128.11.0esr/releasenotes/
    * https://www.mozilla.org/en-US/security/advisories/mfsa2025-46/

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of mozilla-thunderbird installed on the remote host is prior to 128.11.0esr. It is, therefore, affected by multiple vulnerabilities as referenced in the SSA:2025-148-02 advisory.

    New mozilla-thunderbird packages are available for Slackware 15.0 and -current to fix security issues.

Tenable has extracted the preceding description block directly from the mozilla-thunderbird security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Thunderbird installed on the remote Windows host is prior to 128.11. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-46 advisory.

  - Memory safety bug present in Firefox ESR 128.10, and Thunderbird 128.10. This bug showed evidence of     memory corruption and we presume that with enough effort this could have been exploited to run arbitrary     code. (CVE-2025-5269)

  - A double-free could have occurred in `vpxcodecencinitmulti` after a failed allocation when initializing     the encoder for WebRTC. This could have caused memory corruption and a potentially exploitable crash.
    (CVE-2025-5262)

  - Error handling for script execution was incorrectly isolated from web content, which could have allowed     cross-origin leak attacks. (CVE-2025-5263)

  - Due to insufficient escaping of the newline character in the Copy as cURL feature, an attacker could     trick a user into using this command, potentially leading to local code execution on the user's system.
    (CVE-2025-5264)

  - Due to insufficient escaping of the ampersand character in the Copy as cURL feature, an attacker could     trick a user into using this command, potentially leading to local code execution on the user's system.
    This bug only affects Firefox for Windows. Other versions of Firefox are unaffected. (CVE-2025-5265)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Thunderbird installed on the remote macOS or Mac OS X host is prior to 128.11. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-46 advisory.

  - Memory safety bug present in Firefox ESR 128.10, and Thunderbird 128.10. This bug showed evidence of     memory corruption and we presume that with enough effort this could have been exploited to run arbitrary     code. (CVE-2025-5269)

  - A double-free could have occurred in `vpxcodecencinitmulti` after a failed allocation when initializing     the encoder for WebRTC. This could have caused memory corruption and a potentially exploitable crash.
    (CVE-2025-5262)

  - Error handling for script execution was incorrectly isolated from web content, which could have allowed     cross-origin leak attacks. (CVE-2025-5263)

  - Due to insufficient escaping of the newline character in the Copy as cURL feature, an attacker could     trick a user into using this command, potentially leading to local code execution on the user's system.
    (CVE-2025-5264)

  - Due to insufficient escaping of the ampersand character in the Copy as cURL feature, an attacker could     trick a user into using this command, potentially leading to local code execution on the user's system.
    This bug only affects Firefox for Windows. Other versions of Firefox are unaffected. (CVE-2025-5265)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Thunderbird installed on the remote macOS or Mac OS X host is prior to 139.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-45 advisory.

  - In certain cases, SNI could have been sent unencrypted even when encrypted DNS was enabled.
    (CVE-2025-5270)

  - A double-free could have occurred in `vpxcodecencinitmulti` after a failed allocation when initializing     the encoder for WebRTC. This could have caused memory corruption and a potentially exploitable crash.
    (CVE-2025-5262)

  - Error handling for script execution was incorrectly isolated from web content, which could have allowed     cross-origin leak attacks. (CVE-2025-5263)

  - Due to insufficient escaping of the newline character in the Copy as cURL feature, an attacker could     trick a user into using this command, potentially leading to local code execution on the user's system.
    (CVE-2025-5264)

  - Due to insufficient escaping of the ampersand character in the Copy as cURL feature, an attacker could     trick a user into using this command, potentially leading to local code execution on the user's system.
    This bug only affects Firefox for Windows. Other versions of Firefox are unaffected. (CVE-2025-5265)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Thunderbird installed on the remote Windows host is prior to 139.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-45 advisory.

  - In certain cases, SNI could have been sent unencrypted even when encrypted DNS was enabled.
    (CVE-2025-5270)

  - A double-free could have occurred in `vpxcodecencinitmulti` after a failed allocation when initializing     the encoder for WebRTC. This could have caused memory corruption and a potentially exploitable crash.
    (CVE-2025-5262)

  - Error handling for script execution was incorrectly isolated from web content, which could have allowed     cross-origin leak attacks. (CVE-2025-5263)

  - Due to insufficient escaping of the newline character in the Copy as cURL feature, an attacker could     trick a user into using this command, potentially leading to local code execution on the user's system.
    (CVE-2025-5264)

  - Due to insufficient escaping of the ampersand character in the Copy as cURL feature, an attacker could     trick a user into using this command, potentially leading to local code execution on the user's system.
    This bug only affects Firefox for Windows. Other versions of Firefox are unaffected. (CVE-2025-5265)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
261192	Linux Distros Unpatched Vulnerability : CVE-2025-5262	Nessus	Misc.	critical
249156	Fedora 43 : libvpx (2025-8d38482143)	Nessus	Fedora Local Security Checks	high
241311	Fedora 42 : thunderbird (2025-a52491bdd9)	Nessus	Fedora Local Security Checks	medium
240846	SUSE SLED15 / SLES15 / openSUSE 15 Security Update : MozillaThunderbird (SUSE-SU-2025:01946-1)	Nessus	SuSE Local Security Checks	medium
237946	Fedora 41 : libvpx (2025-15220f1411)	Nessus	Fedora Local Security Checks	high
237877	Fedora 42 : libvpx (2025-f5bf0fb721)	Nessus	Fedora Local Security Checks	high
237628	Fedora 41 : thunderbird (2025-5bf1989d48)	Nessus	Fedora Local Security Checks	medium
237428	Slackware Linux 15.0 / current mozilla-thunderbird Multiple Vulnerabilities (SSA:2025-148-02)	Nessus	Slackware Local Security Checks	medium
237388	Mozilla Thunderbird < 128.11	Nessus	Windows	medium
237387	Mozilla Thunderbird < 128.11	Nessus	MacOS X Local Security Checks	medium
237386	Mozilla Thunderbird < 139.0	Nessus	MacOS X Local Security Checks	high
237385	Mozilla Thunderbird < 139.0	Nessus	Windows	high

Detections

Analytics

CVE-2025-5262

high

Tenable Plugins

critical

high

medium

medium

high

high

medium

medium

medium

medium

high

high