CVE-2026-116269 MIME::Field::ParamVal versions before 5.521 for Perl turn an RFC 2231 filename with a hyphenated language tag into an empty recommended filename.
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-116269?
CVE-2026-116269 is a vulnerability, published on 28 Oct 2026.
Official 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.
Weakness: CWE-436
Which versions are affected by CVE-2026-116269?
How do I fix CVE-2026-116269?
No fix has been published for CVE-2026-116269 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-116269 being exploited?
There is no known exploitation of CVE-2026-116269 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-116269, GHSA-h2xx-9xmf-ppmv, UBUNTU-CVE-2026-116269.