HTTP::Parser::XS for Perl truncates PATH_INFO at encoded NUL byte
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA.
Summary
HTTP::Parser::XS versions before 0.18 for Perl truncate PATH_INFO at an encoded NUL byte. The XS parser URL-decodes the request path and measures it with strlen(), so PATH_INFO ends at the first byte decoded from %00 (CWE-626). A remote unauthenticated attacker can send a path that a proxy or filter checks in full while the application routes on the shorter one. The pure-Perl backend is not affected.
Written with Claude Haiku 5.5 from the sources below · 2026-11-06
Description from the CNA
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | HTTP-Parser-XS | before 0.18 | 0.18 | Patch available | CNA |
- HTTP-Parser-XS Vendor— Affected before 0.18 Fixed in 0.18 Patch available CNA
Remediation
Upgrade HTTP-Parser-XS to version 0.18, which fixes the issue.
Written with Claude Haiku 5.5 from the sources below · 2026-11-06
- Fix · CNA HTTP-Parser-XS Fixed in 0.18
Vendor assessments
Timeline
- 2026-10-30 Threatist record created from CVE-2026-116130
- 2026-10-30 Alias added: GHSA-qgp9-frp4-99qf
- 2026-10-30 Affected versions changed · Red Hat
- 2026-10-30 CVSS score added · Red Hat
- 2026-11-06 CVSS score added · CISA ADP
- 2026-11-06 CISA SSVC decision points changed
- 2026-11-06 Priority changed: LOW → MEDIUM
References
Sources
- CVE-2026-116130 · CVE Program
- CVE-2026-116130 · NVD
- FIRST EPSS
- GHSA-qgp9-frp4-99qf · GitHub Advisory Database · CC BY 4.0
- CVE-2026-116130 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences