CVE-2026-32762 Rack: Forwarded Header semicolon injection enables Host and Scheme spoofing

Rack is a modular Ruby web server interface. From versions 3.0.0.beta1 to before 3.1.21 and 3.2.0 to before 3.2.6, Rack::Utils.forwardedvalues parses the RFC 7239 Forwarded header by splitting on semicolons before handling quoted-string values. Because quoted values may legally contain semicolons...

PT-2026-29921

Summary Rack::Utils.forwarded values parses the RFC 7239 Forwarded header by splitting on semicolons before handling quoted-string values. Because quoted values may legally contain semicolons, a header such as: http Forwarded: for="127.0.0.1;host=evil.com;proto=https" can be interpreted by Rack a...

Use the IIS semicolon parsing upload vulnerability analysis-vulnerability warning-the black bar safety net

First look at the following a very common file upload extension filter code: fileExt=lcaseofile. FileExt arrUpFileType=splitUpFileType,"|" for i=0 to uboundarrUpFileType if fileEXT=trimarrUpFileTypei then EnableUpload=true exit for end if next if fileEXT="asp" or fileEXT="asa" or fileEXT="aspx" o...