CVE-2026-116272 MIME::Field::ParamVal versions before 5.521 for Perl do not flag a duplicate boundary parameter whose name contains a nested comment.
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-116272?
CVE-2026-116272 is a vulnerability, published on 28 Oct 2026.
Official description
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.
Weakness: CWE-436
Which versions are affected by CVE-2026-116272?
How do I fix CVE-2026-116272?
No fix has been published for CVE-2026-116272 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-116272 being exploited?
There is no known exploitation of CVE-2026-116272 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-116272, GHSA-hx8x-4mjr-grc3, UBUNTU-CVE-2026-116272.