PT-2026-129086
CVE-2026-116272
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Published
2026-10-28
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Updated
2026-10-28
Description by
Score
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MIME::Field::ParamVal versions before 5.521 for Perl do not flag a duplicate boundary parameter whose name contains a nested comment.
A parameter written boundary((c))="A" or boundary())="A" is stored under that literal name rather than as boundary. A second boundary parameter is then not reported as a duplicate, and MIME::Parser splits the message on it.
Readers that skip comments as RFC 5322 allows take the first boundary instead. A remote sender can hide an attachment from a filter that relies on ambiguous content() while the recipient's mail client shows it.
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