{"id":"CVE-2026-120635","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","summary":"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.\n\nThe multipart/form-data parser matches the boundary anywhere rather than at the start of a line, …","severity":"none","cwe":["CWE-436"],"product":"CGI","affected":["CGI < 5.00"],"published":"2026-11-03","updated":"2026-11-03","sourceUpdated":"2026-11-03T23:40:15.070Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-120635","references":[{"url":"https://www.rfc-editor.org/rfc/rfc2046#section-5.1.1"},{"url":"https://metacpan.org/release/LEEJO/CGI-4.72/source/lib/CGI.pm"},{"url":"https://metacpan.org/release/LEEJO/CGI-5.00/changes"},{"url":"https://github.com/leejo/CGI.pm/commit/f719fc08e8756708bcd4f1e357d5c0f8702f85dd.patch"},{"url":"https://github.com/leejo/CGI.pm/commit/cbf04979f9974458ac223793bbd9d0b6a772aa66.patch"},{"url":"https://github.com/leejo/CGI.pm/commit/fe9516804d59a3774e280c15dbb7072fbd0ba5f1.patch"},{"url":"https://github.com/leejo/CGI.pm/commit/e0ef8f4248c6ae3025749040d8595d206b6a1b49.patch"}],"tags":["cve.org"],"epss":0.00198,"epssPercentile":0.09753,"ingestedAt":"2026-11-05T20:33:06.614Z","slug":"CVE-2026-120635","body":"## Overview\n\nCGI versions before 5.00 for Perl allow form fields to be smuggled past proxies and WAFs via multipart parsing that differs from the RFCs.\n\nThe 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.\n\n## Affected\n\n- `CGI < 5.00`\n\n## Remediation\n\nUpgrade to CGI 5.00 or later.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}