The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applicationsThere is no fixed version for Debian:14 libhttp-body-perl.
Note: Versions mentioned in the description apply only to the upstream libhttp-body-perl package and not the libhttp-body-perl package as distributed by Debian.
See How to fix? for Debian:14 relevant fixed versions and status.
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.