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VulnerabilityPublished

CVE-2026-120642: CGI versions before 5.00 for Perl return request-derived values untainted under taint mode

Source GCVE Database

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Authoritative record:CVE-2026-120642· 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

If you cannot patch yet, users should carefully validate and sanitize all input data manually, especially those values returned untainted under taint mode.

Description

CGI versions for Perl prior to 5.00 have a vulnerability where certain request-derived values are returned untainted under Perl's taint mode. This includes upload filenames, uploadInfo values, some path_info and script_name values, Accept headers, and certain cookie values. These values bypass taint checks because they originate from regex captures or hash keys, which Perl does not mark as tainted, potentially allowing unvalidated data to be used in security-sensitive contexts.

References

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