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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-120639
StatePUBLISHED
AssignerCPANSec
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-04 00:17:25 UTC
Updated2026-11-04 18:42:35 UTC
DescriptionCGI 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.

Risk And Classification

EPSS: 0.002270000 probability, percentile 0.135050000 (date 2026-11-04)

Problem Types: CWE-113 | CWE-113 CWE-113 Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')

References

ReferenceSourceLinkTags
metacpan.org/release/LEEJO/CGI-5.00/changes 9b29abf9-4ab0-4765-b253-1875cd9b441e metacpan.org
github.com/leejo/CGI.pm/commit/69955309d371c8093d11cf12e3ddef491537ffad.... 9b29abf9-4ab0-4765-b253-1875cd9b441e github.com
github.com/leejo/CGI.pm/commit/7733c2753f4f240012097507cda2b6e87ae46db4.... 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
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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