Mime Parser up to 5.520 FileUnder path traversal

Summaryinfo

A vulnerability was found in Mime Parser up to 5.520 and classified as problematic. The impacted element is an unknown function of the component FileUnder. Such manipulation leads to path traversal. This vulnerability is listed as CVE-2026-116271. The attack must be carried out locally. There is no available exploit. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Mime Parser up to 5.520. It has been rated as problematic. Affected by this issue is an unknown code of the component FileUnder. The manipulation with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Impacted is confidentiality, integrity, and availability. CVE summarizes:

MIME::Parser::FileUnder versions before 5.521 for Perl reuse a pre-created output directory and follow symlinks in it, letting local users redirect attachment writes. Each message is written to a directory named msg-<time>-<pid>-<n> under the output base, and an existing directory of that name is used as is. A file name counts as unused when nothing exists at that path, which holds for a dangling symlink, and the body file is then opened in a way that follows the link. When the output base is writable by other users, as with output_under("/tmp"), a local user can pre-create the directory with a symlink named like an attachment. The parser then writes the attachment to the link target with the privileges of the parsing process.

The advisory is available at metacpan.org. This vulnerability is handled as CVE-2026-116271 since 10/25/2026. The exploitation is known to be easy. Local access is required to approach this attack. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1006 by the MITRE ATT&CK project.

Upgrading to version 5.521 eliminates this vulnerability.

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Productinfo

Name

• Mime Parser

Version

• 5.520

CPE 2.3info

• 🔒

CPE 2.2info

• 🔒

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