Bug 2563991 (CVE-2026-116130)

Summary: CVE-2026-116130 perl-http-parser-xs: HTTP::Parser::XS: Security control bypass via path truncation on encoded null bytes
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in HTTP::Parser::XS. When processing HTTP request paths, the parser URL-decodes the path and terminates the string at decoded null bytes rather than using the full path length. A remote attacker can exploit this flaw by sending a crafted path containing an encoded null byte (%00) to create a discrepancy between frontend security proxies and backend routing, potentially bypassing access control restrictions.
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Bug Depends On: 2566077, 2566078, 2566081, 2566086, 2566088    
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Description OSIDB Bzimport 2026-10-30 13:17:35 UTC 
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.