CVE-2026-120635: CGI (Perl module) · Interpretation Conflict
Affects CGI (Perl module)Source CVE Database V5
Not known to be exploited : upgrade to 5.00 soon.
Data as of 4 Nov 2026, 01:00 UTC
Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD
Thin evidence
One scorer or none- Patch
- Available – fixed in 5.00
Exploitation evidence
Disclosed: evidence found.
CVE published 3 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 3 Nov 2026.
What to do
Upgrade CGI (Perl module) to 5.00.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| CGI | Affected
| Fixed in
|
CPANCGIpkg:cpan/CGIOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
A fixed version 5.00 of CGI for Perl is available that addresses these multipart parsing issues. Users should upgrade to version 5.00 or later to remediate this vulnerability. No other mitigation actions are indicated.
Description
A vulnerability in CGI versions prior to 5.00 for Perl allows form fields to be smuggled past proxies and web application firewalls due to multipart parsing that deviates from RFC standards. This includes matching boundaries anywhere instead of at line starts, improper handling of boundaries for certain User-Agent values, and corruption of parts near the 4096-byte read size limit.
References
- rfc-editor.org/rfc/rfc2046 (opens in a new tab)
- metacpan.org/release/LEEJO/CGI-4.72/source/lib/CGI.pm (opens in a new tab)
- metacpan.org/release/LEEJO/CGI-5.00/changes (opens in a new tab)
- github.com/leejo/CGI.pm/commit/f719fc08e8756708bcd4f1e357d5c0f8702f85dd.patch (opens in a new tab)
- github.com/leejo/CGI.pm/commit/cbf04979f9974458ac223793bbd9d0b6a772aa66.patch (opens in a new tab)
- github.com/leejo/CGI.pm/commit/fe9516804d59a3774e280c15dbb7072fbd0ba5f1.patch (opens in a new tab)
- github.com/leejo/CGI.pm/commit/e0ef8f4248c6ae3025749040d8595d206b6a1b49.patch (opens in a new tab)