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HTTP::Body versions before 1.23_01 for Perl allow CPU exhaustion via quadratic regex backtracking when parsing chunked request bodies. In chunked mode, used when no content length is given, add() matches each chunk-size line with `/^([\da-fA-F]+).*\x0D\x0A/`. On a line of hex digits whose first LF has no CR before it, the digits and `.*` backtrack against each other, so a single add() takes time quadratic in the line's length. Nothing limits how long the line can be. A remote attacker can exhaust CPU in applications that pass chunked request bodies to HTTP::Body.

• https://github.com/libwww-perl/HTTP-Body/commit/954a5343d2a095b59d357f28759c5388d1169574.patch patch
• https://metacpan.org/release/GETTY/HTTP-Body-1.24/changes release-notes