Medium [CVE-2026-116269] Attachment filter bypass via improper filename decoding
This medium-severity Red Hat Linux advisory covers CVE-2026-116269 affecting Red Hat Enterprise Linux 6, Red Hat package: perl-mime-tools.
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Summary
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.
A flaw was found in MIME-tools. When parsing email attachment filenames that contain hyphenated language tags, the decoder fails to properly process the character set and incorrectly returns an empty filename.
A remote attacker can exploit this flaw by sending a specially crafted email message to bypass file extension security controls. As a result, restricted or malicious file attachments may pass undetected through email filtering systems and reach end users.
Red Hat severity: Moderate — CVSS 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N). Weakness: CWE-115.
Affected Red Hat products: Red Hat Enterprise Linux 6. Will not fix / out of support: Red Hat Enterprise Linux 6.
- < 5.521
Official advisory · high-confidence parse· fetched 9 hours ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists. Confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 9 hours ago·verify at source
Mitigation
The source record does not include mitigation steps. That does not mean no fix exists. Read the vendor advisory below for the authoritative guidance.
Official advisory · high-confidence parse· fetched 9 hours ago·verify at source
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