========================================================================
CVE-2026-120635                                      CPAN Security Group
========================================================================

        CVE ID:  CVE-2026-120635

  Distribution:  CGI
      Versions:  before 5.00
      MetaCPAN:  https://metacpan.org/dist/CGI
      VCS Repo:  https://github.com/leejo/CGI.pm

CGI versions before 5.00 for Perl allow form fields to be smuggled past
proxies and WAFs via multipart parsing that differs from the RFCs

Description
-----------
CGI versions before 5.00 for Perl allow form fields to be smuggled past
proxies and WAFs via multipart parsing that differs from the RFCs.

The multipart/form-data parser matches the boundary anywhere rather
than at the start of a line, uses the boundary without its leading --
for some client-supplied User-Agent values, finds the
Content-Disposition name and filename inside the quoted values of other
parameters, and corrupts parts when the boundary nears the 4096-byte
read size.

Problem types
-------------
- CWE-436 Interpretation Conflict

Solutions
---------
Upgrade to CGI 5.00 or later.

References
----------
https://www.rfc-editor.org/rfc/rfc2046#section-5.1.1
https://metacpan.org/release/LEEJO/CGI-4.72/source/lib/CGI.pm
https://metacpan.org/release/LEEJO/CGI-5.00/changes
https://github.com/leejo/CGI.pm/commit/f719fc08e8756708bcd4f1e357d5c0f8702f85dd.patch
https://github.com/leejo/CGI.pm/commit/cbf04979f9974458ac223793bbd9d0b6a772aa66.patch
https://github.com/leejo/CGI.pm/commit/fe9516804d59a3774e280c15dbb7072fbd0ba5f1.patch
https://github.com/leejo/CGI.pm/commit/e0ef8f4248c6ae3025749040d8595d206b6a1b49.patch