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.
Analysis
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Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
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Vendor Solution
Upgrade to CGI 5.00 or later.
Tracking
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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 |
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Subscriptions
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MITRE
Status: PUBLISHED
Assigner: CPANSec
Published:
Updated: 2026-11-03T23:40:30.552Z
Reserved: 2026-11-02T17:40:59.077Z
Link: CVE-2026-120639
Vulnrichment
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NVD
Status : Received
Published: 2026-11-04T00:17:25.263
Modified: 2026-11-04T00:17:25.263
Link: CVE-2026-120639
Redhat
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OpenCVE Enrichment
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CWE-113
Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')