CVE-2025-4086

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 Thunderbird for Android. Other versions of Thunderbird are unaffected.* This vulnerability affects Firefox < 138 and Thunderbird < 138. More information : https://bugzilla.mozilla.org/show_bug.cgi?id=1945705