MIME::Field::ParamVal versions before 5.521 for Perl allow CPU exhaustion via unclosed comments in header parameters. The comment pattern used to parse Content-Type and Content-Disposition parameters scans from each "(" to the next ")". In a field with no ")", every "(" scans to the end of the header and fails, so parsing takes time quadratic in the header length. The field is parsed again on each attribute lookup, several times per MIME entity. A 40 KB header takes about 7 seconds to parse once.
Fix
Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.
Change history 4
- StatusReceived → PublishedNVD modified 2026-10-28 17:33
- StatusPublished → ReceivedNVD modified 2026-10-28 18:17
- StatusReceived → PublishedNVD modified 2026-10-28 17:33
- First seenunscoredNVD modified 2026-10-28 18:17
Affected (CPE criteria) 0
NVD has not attached CPE configurations yet.