UBUNTU-CVE-2026-116272

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UBUNTU-CVE-2026-116272

Summary:

Details: 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.

References: https://ubuntu.com/security/CVE-2026-116272, https://www.cve.org/CVERecord?id=CVE-2026-116272, https://metacpan.org/release/DSKOLL/MIME-tools-5.522/changes