CVE-2026-121006

HTTP::Body versions before 1.24_02 for Perl parse the trailer in quadratic time

Published Nov 6, 2026 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Description
HTTP::Body versions before 1.24_02 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.

Remediation

Vendor Solution

Upgrade to HTTP::Body version 1.24_02 or later.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Type Values Removed Values Added
First Time appeared Libwww-perl
Libwww-perl http-body
Vendors & Products Libwww-perl
Libwww-perl http-body
Type Values Removed Values Added
Description HTTP::Body versions before 1.24_02 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.
Title HTTP::Body versions before 1.24_02 for Perl parse the trailer in quadratic time
Weaknesses CWE-770
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
CPANSec
Published
Updated
Nov 10, 2026, 5:33 PM
Reserved
Nov 3, 2026, 7:58 AM
Status
Deferred
Published
Nov 6, 2026, 8:17 AM
Modified
Nov 12, 2026, 8:07 PM