CVE-2026-121006: HTTP::Body versions before 1.24_02 for Perl parse the trailer in quadratic time

HTTP::Body versions before 1.2402 for Perl parse the trailer in quadratic time.

Everything after the last chunk in the same call to add() is parsed with HTTP::Headers, which takes time quadratic in the number of fields of one name. For example, it takes several seconds to parse 16 KiB of "a:" lines.

A remote attackercan exhause the CPU with a single request.

HTTP::Body version 1.25 limits the size and number of lines in the trailer.