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OpenAdvisories
High ALAS2-2025-2896 1 CVE

Important: thunderbird security update (Amazon Linux 2)

Published Jun 18, 2025 · Updated Jun 24, 2025

Ecosystem: Amazon Linux

Summary

Package updates are available for Amazon Linux 2 that fix the following vulnerabilities: CVE-2025-5986: A crafted HTML email using mailbox:/// links can trigger automatic, unsolicited downloads of .pdf files to the user's desktop or home directory without prompting, even if auto-saving is disabled. This behavior can be abused to fill the disk with garbage data (e.g. using /dev/urandom on Linux) or to leak Windows credentials via SMB links when the email is viewed in HTML mode. While user interaction is required to download the .pdf file, visual obfuscation can conceal the download trigger. Viewing the email in HTML mode is enough to load external content. This vulnerability affects Thunderbird < 128.11.1 and Thunderbird < 139.0.2.

Fixed packages 2

ReleasePackageFixed in
Amazon Linux · 2 thunderbird 0:128.11.1-1.amzn2.0.1
Amazon Linux · 2 thunderbird-debuginfo 0:128.11.1-1.amzn2.0.1

Vulnerabilities 1

  • Medium 6.5
    CVE-2025-5986

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

    A crafted HTML email using mailbox:/// links can trigger automatic, unsolicited downloads of .pdf files to the user's desktop or home directory without prompting, even if auto-saving is disabled. This behavior can be abused to fill the disk with garbage data …

    Mozilla Thunderbird thunderbird thunderbird Debian Ubuntu

References

  • web
    https://alas.aws.amazon.com/cve/html/CVE-2025-5986.html