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VulnerabilityPublished

CVE-2026-120637: CGI versions before 5.00 for Perl take request parameters from the process command line arguments

Source GCVE Database

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Authoritative record:CVE-2026-120637· Medium

Not known to be exploited : upgrade to 5.00 when convenient.

Data as of 4 Nov 2026, 01:58 UTC

Severity
Medium

Rated Medium 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

  1. Disclosed: evidence found.

    CVE published 3 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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

ProductAffectedFixed in
CGIAffected
  • <5.00
Fixed in
  • 5.00
CPANCGIpkg:cpan/CGIOther threatsAffected
  • <5.00
Fixed in
  • 5.00

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Users should consider upgrading to CGI version 5.00 or later where this behavior is presumably corrected. If you cannot patch yet, avoid using unrecognized HTTP methods with affected CGI versions or disable the offline debugging mode if possible.

Description

CGI versions for Perl prior to 5.00 improperly handle unrecognized REQUEST_METHOD values by taking request parameters from the process command line arguments. Specifically, for methods like OPTIONS, CGI defaults to an offline debugging mode that is enabled by default and constructs parameters and path_info from the command line arguments.

References

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