CVE-2026-120638: CGI (Perl module) · Incorrect Behavior Order: Validate Before Canonicalize
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
Upgrade to CGI version 5.00 or later, where this vulnerability is fixed. No other mitigation is indicated or required by the vendor advisory.
Description
CGI versions prior to 5.00 for Perl contain an open redirect vulnerability due to improper ordering of validation and canonicalization. The redirect function decodes HTML entities in the URL after validation, allowing a validated URL to be transformed into a different URL that can redirect users to an unintended external host.