CVE-2026-120635 · agentprime

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

No CVSS scoreEPSS 0.0020 · 9th percentile

Published by the CVE Program (CNA: CPANSec) at 3 Nov 2026, 23:40 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
Not given	Not given Package name: CGI https://cpan.org/modules pkg:cpan/CGI	affected before 5.00 custom Other versions: unaffected

Identifiers

CVE-2026-120635

CNA

CPANSec

Weakness (CWE)

CWE-436

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

No source has published a CVSS score for this record yet.

CISA KEV Not listed.
EPSS 0.0020, the 9th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

3 Nov 2026, 23:40 UTC Confirmed by the CVE List
3 Nov 2026, 23:48 UTC First seen by agentprime
4 Nov 2026, 00:17 UTC Confirmed by NVD

Sources

References from the CNA

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

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.