libmime-tools-perl: MIME::Field::ParamVal versions before 5.521 for Perl allow CPU exhaustion via unclosed comments in header parameters
CVE-2026-116268 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-116268, released November 3, 2026. It is not reported as exploited. Patch Radar priority: High.
MIME::Field::ParamVal versions before 5.521 for Perl allow CPU exhaustion via unclosed comments in header parameters. The comment pattern used to parse Content-Type and Content-Disposition parameters scans from each "(" to the next ")". In a field with no ")", every "(" scans to the end of the header and fails, so parsing takes time quadratic in the header length. The field is parsed again on each attribute lookup, several times per MIME entity. A 40 KB header takes about 7 seconds to parse once.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| libmime-tools-perl · Debian 14 | 5.522-1 | DEBIAN-CVE-2026-116268 | Nov 3, 2026 |
| perl-MIME-tools · Fedora 43 | 5.522-1.fc43 | FEDORA-2026-A415B3BF48 | Nov 7, 2026 |
| perl-MIME-tools · opensuse-leap 16.0 | 5.522.0-bp160.1.1 | OPENSUSE-SU-2026:22226-1 | Nov 7, 2026 |
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