UBUNTU-CVE-2026-116264

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UBUNTU-CVE-2026-116264

Summary:

Details: MIME::Field::ParamVal versions before 5.521 for Perl allow one invalid Content-Type parameter to hide the parameters after it, including the multipart boundary. Parameter parsing stops at the first parameter whose name it cannot read, such as x:y=1 or a name containing an 8-bit byte, and drops every parameter after it. When the boundary is among them, MIME::Parser keeps the multipart body as a single undecoded part without marking the parse as ambiguous. Mail readers that skip the invalid parameter still find the boundary. 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-2026-116264, https://www.cve.org/CVERecord?id=CVE-2026-116264, https://metacpan.org/release/DSKOLL/MIME-tools-5.522/changes