DSKOLL MIME::Field::ParamVal up to 5.520 Parameter Parsing ambiguous_content input validation

Summaryinfo

A vulnerability classified as problematic has been found in DSKOLL MIME::Field::ParamVal up to 5.520. Affected is the function ambiguous_content of the component Parameter Parsing. This manipulation causes input validation. The identification of this vulnerability is CVE-2026-116264. It is possible to initiate the attack remotely. There is no exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in DSKOLL MIME::Field::ParamVal up to 5.520. It has been declared as problematic. Affected by this vulnerability is the function ambiguous_content of the component Parameter Parsing. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect integrity. The summary by CVE is:

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.

It is possible to read the advisory at metacpan.org. This vulnerability is known as CVE-2026-116264 since 10/25/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 5.521 eliminates this vulnerability.

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Productinfo

Vendor

• DSKOLL

Name

• MIME::Field::ParamVal

Version

• 5.520

CPE 2.3info

• 🔒

CPE 2.2info

• 🔒

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