The multipart/form-data parser matches the boundary anywhere rather than at the start of a line, uses the boundary without its leading -- for some client-supplied User-Agent values, finds the Content-Disposition name and filename inside the quoted values of other parameters, and corrupts parts when the boundary nears the 4096-byte read size.
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 form fields to be smuggled past proxies and WAFs via multipart parsing that differs from the RFCs. The multipart/form-data parser matches the boundary anywhere rather than at the start of a line, uses the boundary without its leading -- for some client-supplied User-Agent values, finds the Content-Disposition name and filename inside the quoted values of other parameters, and corrupts parts when the boundary nears the 4096-byte read size. | |
| Title | CGI versions before 5.00 for Perl allow form fields to be smuggled past proxies and WAFs via multipart parsing that differs from the RFCs | |
| Weaknesses | CWE-436 | |
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Subscriptions
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MITRE
Status: PUBLISHED
Assigner: CPANSec
Published:
Updated: 2026-11-03T23:40:15.070Z
Reserved: 2026-11-02T17:40:25.384Z
Link: CVE-2026-120635
Vulnrichment
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NVD
Status : Received
Published: 2026-11-04T00:17:24.730
Modified: 2026-11-04T00:17:24.730
Link: CVE-2026-120635
Redhat
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OpenCVE Enrichment
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