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Vulnerability · Published Oct 28, 2026 · Assigned by CPANSec

CVE-2026-117500HTTP::Body versions before 1.24_01 for Perl allow CPU exhaustion via regex backtracking on the filename of a multipart upload

High 7.5

In plain English

A high-severity regular-expression denial of service in HTTP-Body. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 39% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.5%top 60.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12libhttp-body-perlno fix listedDEBIAN-CVE-2026-117500
Debian:13libhttp-body-perlno fix listedDEBIAN-CVE-2026-117500
Debian:14libhttp-body-perl1.24.01-1DEBIAN-CVE-2026-117500
Ubuntu:22.04:LTSlibhttp-body-perlno fix listedUBUNTU-CVE-2026-117500
Ubuntu:24.04:LTSlibhttp-body-perlno fix listedUBUNTU-CVE-2026-117500
Ubuntu:26.04:LTSlibhttp-body-perlno fix listedUBUNTU-CVE-2026-117500
Ubuntu:26.10libhttp-body-perlno fix listedUBUNTU-CVE-2026-117500

Affected products (as reported)

VendorProductVersions
HTTP-Body 0 – before 1.24_01

Weakness: CWE-1333 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References