Description
CGI versions before 5.00 for Perl allow HTTP header injection via entity decoding after the newline check in header and unchecked values in multipart_start and do_push.

With autoEscape off, header decodes HTML entities in extra header values after its newline check, so an encoded CR or LF reaches the response. multipart_start does not check header values for newlines, and do_push does not check the type it prints in each part.

An application that passes request data into these header values can be made to add headers or split the response.
Published: 2026-11-03
Score: 6.5 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
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Remediation

Vendor Solution

Upgrade to CGI 5.00 or later.

Tracking

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Advisories

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History

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

Type Values Removed Values Added
Weaknesses CWE-93
References
Metrics threat_severity

None

cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N'}

threat_severity

Moderate


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

Type Values Removed Values Added
Description CGI versions before 5.00 for Perl allow HTTP header injection via entity decoding after the newline check in header and unchecked values in multipart_start and do_push. With autoEscape off, header decodes HTML entities in extra header values after its newline check, so an encoded CR or LF reaches the response. multipart_start does not check header values for newlines, and do_push does not check the type it prints in each part. An application that passes request data into these header values can be made to add headers or split the response.
Title CGI versions before 5.00 for Perl allow HTTP header injection via entity decoding after the newline check in header and unchecked values in multipart_start and do_push
Weaknesses CWE-113
References

Subscriptions

No data.

cve-icon MITRE

Status: PUBLISHED

Assigner: CPANSec

Published:

Updated: 2026-11-03T23:40:30.552Z

Reserved: 2026-11-02T17:40:59.077Z

Link: CVE-2026-120639

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Deferred

Published: 2026-11-04T00:17:25.263

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

Link: CVE-2026-120639

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-11-03T23:40:30Z

Links: CVE-2026-120639 - Bugzilla

cve-icon OpenCVE Enrichment

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

Weaknesses
  • CWE-113

    Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')

  • CWE-93

    Improper Neutralization of CRLF Sequences ('CRLF Injection')