Web::Simple versions before 0.035 for Perl allocate a buffer sized by the Content-Length header for urlencoded body parameters

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-114629
StatePUBLISHED
AssignerCPANSec
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-24 14:16:39 UTC
Updated2026-10-24 17:16:26 UTC
DescriptionWeb::Simple versions before 0.035 for Perl allocate a buffer sized by the Content-Length header for urlencoded body parameters. Web::Dispatch::ParamParser::get_unpacked_body_from reads an application/x-www-form-urlencoded body using a single read call, with no cap and the return value ignored. Perl's read grows the buffer to the requested length before reading, so the declared Content-Length determines the allocation. An attacker can trigger this through any route whose dispatch specification has a % body-parameter match, such as sub (POST + %name=), sending a Content-Length far larger than the body actually sent. No authentication is involved.

Risk And Classification

Problem Types: CWE-789 | CWE-789 CWE-789 Memory Allocation with Excessive Size Value

References

ReferenceSourceLinkTags
metacpan.org/release/ETHER/Web-Simple-0.035/changes 9b29abf9-4ab0-4765-b253-1875cd9b441e metacpan.org
www.openwall.com/lists/oss-security/2026/10/24/4 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
github.com/p5sagit/Web-Simple/commit/7e02c4f6204a2898938d357e6efe6dc2679... 9b29abf9-4ab0-4765-b253-1875cd9b441e github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

Solutions

CNA: Upgrade to Web::Simple 0.035 or later, and in the application configure $Web::Dispatch::ParamParser::MAX_BODY_SIZE.

Workarounds

CNA: For deployments that cannot upgrade but are running behind a reverse proxy, configure the proxy to reject requests above a maxiumum Content-Length.

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