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VulnerabilityPublished Updated

CVE-2026-120642: Libcgi pm perl · CGI versions before 5.00 for Perl return request-derived values untainted under

Affects libcgi-pm-perlSource GCVE Database

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Authoritative record:CVE-2026-120642· Critical 9.1

Not known to be exploited · CVSS 9.1 Critical.

Data as of 12 Nov 2026, 21:02 UTC

CVSS 3.1 base score
9.1Critical
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CISA-ADPCVSS 3.19.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

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 12 Nov 2026.

What to do

Affected software

ProductAffectedFixed in
Ubuntu 26.10libcgi-pm-perlpkg:deb/ubuntu/libcgi-pm-perl?arch=source&distro=stonkingOther threatsAffected
  • =4.71-1build1
  • =4.72-1
Fixed in–
Ubuntu 26.04 LTSlibcgi-pm-perlpkg:deb/ubuntu/libcgi-pm-perl?arch=source&distro=resoluteOther threatsAffected
  • =4.68-1
  • =4.71-1
  • =4.71-1build1
Fixed in–
Ubuntu 24.04 LTSlibcgi-pm-perlpkg:deb/ubuntu/libcgi-pm-perl?arch=source&distro=nobleOther threatsAffected
  • 4.57-1 – 4.63-1
5 affected builds
Fixed in–
Ubuntu 22.04 LTSlibcgi-pm-perlpkg:deb/ubuntu/libcgi-pm-perl?arch=source&distro=jammyOther threatsAffected
  • =4.51-1
  • =4.53-1
  • =4.54-1
Fixed in–
Ubuntu 20.04 LTSlibcgi-pm-perlpkg:deb/ubuntu/libcgi-pm-perl?arch=source&distro=focalOther threatsAffected
  • =4.44-1
  • =4.45-1
  • =4.46-1
Fixed in–
Ubuntu 18.04 LTSlibcgi-pm-perlpkg:deb/ubuntu/libcgi-pm-perl?arch=source&distro=bionicOther threatsAffected
  • =4.36-1
  • =4.37-1
  • =4.38-1
Fixed in–

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

AI-suggested

Until a fix is available, users should consider avoiding affected versions or applying manual mitigations to validate all input explicitly before use.

Description

CGI versions for Perl prior to 5.00 improperly return certain request-derived values as 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 Perl's 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 sensitive operations.

References

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