UBUNTU-CVE-2026-116269

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UBUNTU-CVE-2026-116269

Summary:

Details: MIME::Field::ParamVal versions before 5.521 for Perl turn an RFC 2231 filename with a hyphenated language tag into an empty recommended filename. A parameter such as filename*=utf-8'en-US'payload.exe is converted to an encoded word with the language tag appended to the charset. The decoder strips the language suffix only when it is a single word, so it cannot resolve the charset UTF-8*EN-US and returns an empty string. The recommended_filename() method returns that empty string rather than falling back to the name parameter. Other mail readers return payload.exe. A remote sender can get an attachment past a policy that checks file extensions on the recommended filename.

References: https://ubuntu.com/security/CVE-2026-116269, https://www.cve.org/CVERecord?id=CVE-2026-116269, https://metacpan.org/release/DSKOLL/MIME-tools-5.522/changes