CVE-2026-120651
CGI versions before 5.00 for Perl allow an infinite loop on a short request body when $DISABLE_UPLOADS is set
- State
- Published
- Severity
- Not scored
- Published
- Nov 3, 2026
- Updated
- Nov 3, 2026
- Reserved
- Nov 2, 2026
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.
Scores
The record has no CVSS score.
Weaknesses
- CWE-835 Loop with Unreachable Exit Condition ('Infinite Loop')
Affected Products
| Product | Versions |
|---|---|
CGI |
|
References
- https://metacpan.org/release/LEEJO/CGI-4.72/source/lib/CGI.pmtechnical-description
- https://metacpan.org/release/LEEJO/CGI-5.00/changesrelease-notes
- https://github.com/leejo/CGI.pm/commit/16d9f61acf8b844b7360e8d726338e3ce34dfa9f.patchpatch
- https://github.com/leejo/CGI.pm/commit/8a78305065690461ae283fa24e5ebe4ec8a22fbc.patchpatch
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