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CVE-2026-114629                                      CPAN Security Group
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         CVE ID:  CVE-2026-114629

   Distribution:  Web-Simple
       Versions:  before 0.035
       MetaCPAN:  https://metacpan.org/dist/Web-Simple
       VCS Repo:  https://github.com/p5sagit/Web-Simple

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

Description
-----------
Web::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.

Problem types
-------------
- CWE-789 Memory Allocation with Excessive Size Value

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

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

References
----------
https://github.com/p5sagit/Web-Simple/commit/7e02c4f6204a2898938d357e6efe6dc2679af695.patch
https://metacpan.org/release/ETHER/Web-Simple-0.035/changes