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[SECURITY] [DLA 4239-1] thunderbird security update



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Debian LTS Advisory DLA-4239-1                debian-lts@lists.debian.org
https://www.debian.org/lts/security/                          Adrian Bunk
July 11, 2025                                 https://wiki.debian.org/LTS
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Package        : thunderbird
Version        : 1:128.12.0esr-1~deb11u1
CVE ID         : CVE-2025-5986 CVE-2025-6424 CVE-2025-6425 CVE-2025-6429 
                 CVE-2025-6430

Multiple vulnerabilities have been fixed in the email, calendar and 
contacts client Thunderbird.

CVE-2025-5986

    Unsolicited File Download, Disk Space Exhaustion, and
    Credential Leakage via mailbox:/// Links

CVE-2025-6424

    Use-after-free in FontFaceSet

CVE-2025-6425

    The WebCompat WebExtension shipped exposed a persistent UUID

CVE-2025-6429

    Incorrect parsing of URLs could have allowed embedding of youtube.com

CVE-2025-6430

    Content-Disposition header ignored when a file is included
    in an embed or object tag

For Debian 11 bullseye, these problems have been fixed in version
1:128.12.0esr-1~deb11u1.

We recommend that you upgrade your thunderbird packages.

For the detailed security status of thunderbird please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/thunderbird

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS
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