Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | HTTP-Parser-XS | < 0.18 | 0.18 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | libhttp-parser-xs-perl | 0.18-1 | — |
| Debian 13 | libhttp-parser-xs-perl | No fix yet | — |
| Debian 12 | libhttp-parser-xs-perl | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | libhttp-parser-xs-perl | No fix yet | — |
| Ubuntu 26.04 LTS | libhttp-parser-xs-perl | No fix yet | — |
| Ubuntu 24.04 LTS | libhttp-parser-xs-perl | No fix yet | — |
| Ubuntu 22.04 LTS | libhttp-parser-xs-perl | No fix yet | — |
| Ubuntu 20.04 LTS | libhttp-parser-xs-perl | No fix yet | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | libhttp-parser-xs-perl | No fix yet | — |
| Ubuntu 16.04 LTS | libhttp-parser-xs-perl | No fix yet | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | perl-HTTP-Parser-XS | 0.180.0-1.1 | openSUSE-SU-2026:12389-1 |
Advisories 1
- openSUSE-SU-2026:12389-1 perl-HTTP-Parser-XS-0.180.0-1.1 on GA media SUSE / openSUSE Security Updates · Nov 3, 2026