MIME::Field::ParamVal versions before 5.521 for Perl allow one invalid Content-Type parameter to...
Affected packages
| Ecosystem | Package | Affected | Fixed |
|---|---|---|---|
| https://cpan.org/modules | MIME-tools |
< 5.521 |
5.521 |
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2026-116264 libmime-tools-perl
- Ubuntu UBUNTU-CVE-2026-116264 libmime-tools-perl
Original description The description as published by the source.
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.
Source: CVE.org (CVE Program・cvelistV5) NVD GitHub Advisory
References
- web metacpan.org
- web nvd.nist.gov
- web github.com