Cookie attribute injection in CGI::Cookie for Perl
Key facts
- Attack vector
- —
- Privileges required
- —
- User interaction
- —
- Attack complexity
- —
- Impact type
- —
- Confidentiality · integrity · availability
- —
- Fix status
- Partial Red Hat: 4 without a fix
No CVSS vector from any source. Fix status from CNA and Red Hat.
Summary
CGI::Cookie versions before 5.00 for Perl write the path, domain and expires values into the Set-Cookie header without checking for semicolons or control characters (CWE-116). An application that sets these values from request data can be made to add other cookie attributes, such as Domain or SameSite.
Written with Claude Haiku 5.5 from the sources below · 2026-11-04
Description from the CNA
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.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | CGI | before 5.00 | 5.00 | Patch available | CNA |
- CGI Vendor— Affected before 5.00 Fixed in 5.00 Patch available CNA
Remediation
Upgrade CGI for Perl to version 5.00 or later. Red Hat Enterprise Linux 7, 8, 9 and 10 are affected, and the sources list no fixed version for them.
Written with Claude Haiku 5.5 from the sources below · 2026-11-04
- Fix · CNA CGI Fixed in 5.00
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 7 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 8 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
Timeline
- 2026-11-03 Threatist record created from CVE-2026-120644
- 2026-11-04 Affected versions changed · Red Hat
- 2026-11-04 CVSS score added · Red Hat
- 2026-11-04 Alias added: GHSA-mcq5-fxjx-6f4r
References
Sources
- CVE-2026-120644 · CVE Program
- CVE-2026-120644 · NVD
- FIRST EPSS
- GHSA-mcq5-fxjx-6f4r · GitHub Advisory Database · CC BY 4.0
- CVE-2026-120644 · Red Hat security data · CC BY 4.0
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