CVE-2026-120644

CGI::Cookie versions before 5.00 for Perl allow cookie attribute injection via unvalidated path, domain and expires values

Published Nov 3, 2026 CVSS 3.1 · 9.1 Critical EPSS < 1% KEV · Not listed
Description
CGI::Cookie versions before 5.00 for Perl allow cookie attribute injection via unvalidated path, domain and expires values.

The path, domain and expires values are written into the Set-Cookie header without checking for semicolons or control characters.

An application that sets them from request data can be made to add other cookie attributes, such as Domain or SameSite.

Remediation

Vendor Solution

Upgrade to CGI 5.00 or later.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 4.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N'}

cvssV3_1

{'score': 9.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N'}

Type Values Removed Values Added
Weaknesses CWE-140
References
Metrics threat_severity

None

cvssV3_1

{'score': 4.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N'}

threat_severity

Moderate

Type Values Removed Values Added
Description CGI::Cookie versions before 5.00 for Perl allow cookie attribute injection via unvalidated path, domain and expires values. The path, domain and expires values are written into the Set-Cookie header without checking for semicolons or control characters. An application that sets them from request data can be made to add other cookie attributes, such as Domain or SameSite.
Title CGI::Cookie versions before 5.00 for Perl allow cookie attribute injection via unvalidated path, domain and expires values
Weaknesses CWE-116
References

Subscriptions

No data.

Weaknesses

Sources

Status
PUBLISHED
Assigner
CPANSec
Published
Updated
Nov 9, 2026, 7:33 PM
Reserved
Nov 2, 2026, 5:42 PM
Status
Deferred
Published
Nov 4, 2026, 12:17 AM
Modified
Nov 9, 2026, 8:18 PM
Severity
Moderate
Public date
Nov 3, 2026, 11:40 PM