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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-120635
StatePUBLISHED
AssignerCPANSec
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-04 00:17:24 UTC
Updated2026-11-04 18:42:35 UTC
DescriptionCGI 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.

Risk And Classification

Problem Types: CWE-436 | CWE-436 CWE-436 Interpretation Conflict

References

ReferenceSourceLinkTags
github.com/leejo/CGI.pm/commit/e0ef8f4248c6ae3025749040d8595d206b6a1b49.... 9b29abf9-4ab0-4765-b253-1875cd9b441e github.com
github.com/leejo/CGI.pm/commit/cbf04979f9974458ac223793bbd9d0b6a772aa66.... 9b29abf9-4ab0-4765-b253-1875cd9b441e github.com
metacpan.org/release/LEEJO/CGI-5.00/changes 9b29abf9-4ab0-4765-b253-1875cd9b441e metacpan.org
www.rfc-editor.org/rfc/rfc2046 9b29abf9-4ab0-4765-b253-1875cd9b441e www.rfc-editor.org
github.com/leejo/CGI.pm/commit/f719fc08e8756708bcd4f1e357d5c0f8702f85dd.... 9b29abf9-4ab0-4765-b253-1875cd9b441e github.com
metacpan.org/release/LEEJO/CGI-4.72/source/lib/CGI.pm 9b29abf9-4ab0-4765-b253-1875cd9b441e metacpan.org
github.com/leejo/CGI.pm/commit/fe9516804d59a3774e280c15dbb7072fbd0ba5f1.... 9b29abf9-4ab0-4765-b253-1875cd9b441e github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

Solutions

CNA: Upgrade to CGI 5.00 or later.

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