Bug 2566088

Summary: CVE-2026-116130 perl-HTTP-Parser-XS: HTTP::Parser::XS: Security control bypass via path truncation on encoded null bytes [fedora-rawhide]
Product: [Fedora] Fedora Reporter: Oleg Sushchenko <osushche>
Component: perl-HTTP-Parser-XSAssignee: Emmanuel Seyman <emmanuel>
Status: NEW --- QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: medium    
Version: rawhideCC: emmanuel, perl-devel
Target Milestone: ---Keywords: Security, SecurityTracking
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Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["e14f3fb8-4c5d-435d-854a-73dbe28a1192"]}
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On:    
Bug Blocks: 2563991    

Description Oleg Sushchenko 2026-11-03 18:20:39 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

HTTP::Parser::XS versions before 0.18 for Perl truncate PATH_INFO at an encoded NUL byte in parse_http_request.

The XS parser URL-decodes the request path and measures the result with strlen(), so PATH_INFO ends at the first byte decoded from %00. The pure-Perl backend is not affected.

A remote attacker can send a path that a proxy or filter checks in full while the application routes on a shorter one.