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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.

• https://github.com/kazuho/p5-http-parser-xs/commit/f388b9d7994722b01edd03d57de7d2fb819e1aae.patch patch
• https://metacpan.org/release/KAZUHO/HTTP-Parser-XS-0.18/changes release-notes
• http://www.openwall.com/lists/oss-security/2026/10/30/12