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CVE-2026-120651                                      CPAN Security Group
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        CVE ID:  CVE-2026-120651

  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 an infinite loop on a short
request body when $DISABLE_UPLOADS is set

Description
-----------
CGI versions before 5.00 for Perl allow an infinite loop on a short
request body when $DISABLE_UPLOADS is set.

When $CGI::PUTDATA_UPLOAD or an upload hook is set,
read_postdata_putdata takes a request body that is not a form
submission. With $CGI::DISABLE_UPLOADS set, it discards the body by
reading until Content-Length bytes have arrived. Once a body shorter
than its Content-Length runs out, every read returns 0, so the loop
never ends.

A client can keep a server process spinning with one such request.

Problem types
-------------
- CWE-835 Loop with Unreachable Exit Condition ('Infinite Loop')

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

References
----------
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/16d9f61acf8b844b7360e8d726338e3ce34dfa9f.patch
https://github.com/leejo/CGI.pm/commit/8a78305065690461ae283fa24e5ebe4ec8a22fbc.patch