Vulnerability Description
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.
Related Weaknesses (CWE)
References
FAQ
What is CVE-2026-116269?
CVE-2026-116269 is a documented vulnerability. 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...
How severe is CVE-2026-116269?
CVSS scoring is not yet available for CVE-2026-116269. Check NVD for updates.
Is there a patch for CVE-2026-116269?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.