Bug 2563030 (CVE-2026-117500)

Summary: CVE-2026-117500 perl-HTTP-Body: perl-HTTP-Body: Denial of Service via regular expression backtracking
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in HTTP::Body. A remote attacker could cause a Denial of Service (DoS) by submitting a specially crafted multipart upload request with a malformed filename. Inefficient regular expression processing causes excessive backtracking when parsing the filename, which exhausts CPU resources and degrades system responsiveness.
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Description OSIDB Bzimport 2026-10-28 17:32:43 UTC 
HTTP::Body versions before 1.24_01 for Perl allow CPU exhaustion via regex backtracking on the filename of a multipart upload.

For every file part, the multipart parser finds the suffix of the uploaded filename by matching the default $basename_regexp, qr/[^.]+(\.[^\\\/]+)$/, against the whole basename. A basename made of many dots and ending in a backslash makes the regex backtrack in time quadratic in its length.

A remote attacker can exhaust CPU with one request, as a basename of about 32 KB takes several seconds to match and every file part is matched separately.