Bug 2566077

Summary: CVE-2026-116130 perl-HTTP-Parser-XS: HTTP::Parser::XS: Security control bypass via path truncation on encoded null bytes [epel-10]
Product: [Fedora] Fedora EPEL Reporter: Oleg Sushchenko <osushche>
Component: perl-HTTP-Parser-XSAssignee: Emmanuel Seyman <emmanuel>
Status: ON_QA --- QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: medium    
Version: epel10CC: emmanuel, perl-devel
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
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 18:19:05 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.
Comment 1 Fedora Update System 2026-11-03 23:50:26 UTC 
FEDORA-EPEL-2026-b613641941 (perl-HTTP-Parser-XS-0.18-1.el10_2) has been submitted as an update to Fedora EPEL 10.2.
https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-b613641941
Comment 2 Fedora Update System 2026-11-04 02:27:39 UTC 
FEDORA-EPEL-2026-b613641941 has been pushed to the Fedora EPEL 10.2 testing repository.

You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-b613641941

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.