CGI versions before 5.00 for Perl return upload filenames with any client-supplied path, including ../ and Windows paths.

The name returned for an uploaded file is the filename parameter of the part's Content-Disposition header, unchanged.

An application that saves the upload under this name can be made to write outside the intended directory.
Advisories

No advisories yet.

Fixes

Solution

Upgrade to CGI 5.00 or later.


Workaround

For deployments that cannot upgrade, do not use the client-supplied upload filename as a path.

History

Wed, 04 Nov 2026 12:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N'}

threat_severity

Important


Wed, 04 Nov 2026 00:00:00 +0000

Type Values Removed Values Added
Description CGI versions before 5.00 for Perl return upload filenames with any client-supplied path, including ../ and Windows paths. The name returned for an uploaded file is the filename parameter of the part's Content-Disposition header, unchanged. An application that saves the upload under this name can be made to write outside the intended directory.
Title CGI versions before 5.00 for Perl return upload filenames with any client-supplied path, including ../ and Windows paths
Weaknesses CWE-22
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: CPANSec

Published:

Updated: 2026-11-03T23:40:36.961Z

Reserved: 2026-11-02T17:42:19.176Z

Link: CVE-2026-120641

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Deferred

Published: 2026-11-04T00:17:25.527

Modified: 2026-11-04T18:42:35.810

Link: CVE-2026-120641

cve-icon Redhat

Severity : Important

Publid Date: 2026-11-03T23:40:36Z

Links: CVE-2026-120641 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-11-04T14:15:15Z

Weaknesses