CVE-2025-4086 – Mozilla Firefox and Thunderbird File Extension Disclosure Vulnerability

The following table lists the changes that have been made to the
CVE-2025-4086 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution
of a vulnerability, and for identifying the most recent changes that may
impact the vulnerability’s severity, exploitability, or other characteristics.

  • New CVE Received
    by [email protected]

    Apr. 29, 2025

    Action Type Old Value New Value
    Added Description A specially crafted filename containing a large number of encoded newline characters could obscure the file’s extension when displayed in the download dialog.
    *This bug only affects Firefox for Android. Other versions of Firefox are unaffected.* This vulnerability affects Firefox < 138 and Thunderbird < 138.
    Added Reference https://bugzilla.mozilla.org/show_bug.cgi?id=1945705
    Added Reference https://www.mozilla.org/security/advisories/mfsa2025-28/
    Added Reference https://www.mozilla.org/security/advisories/mfsa2025-31/
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