Vulnerability Description
Improper Neutralization of CRLF Sequences vulnerability in benoitc hackney allows HTTP Request Splitting. hackney does not percent-encode carriage return (\r) or line feed (\n) characters in the URL query component before constructing the HTTP/1.1 request target. Characters outside the grammar defined in RFC 3986 Section 3.4 must be percent-encoded, but hackney_url:make_url/3 passes the query binary directly without validation or escaping. An attacker who can control all or part of a URL passed to hackney can inject raw CRLF sequences into the query string, which are then sent as HTTP line breaks in the request target. This enables injection of arbitrary HTTP headers or splitting of the HTTP request. This issue affects hackney: from 0.13.1 before 4.0.1.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Benoitc | Hackney | < 4.0.1 |
Related Weaknesses (CWE)
References
- https://cna.erlef.org/cves/CVE-2026-47075.htmlPatchThird Party Advisory
- https://github.com/benoitc/hackney/commit/ca73dd0aba0ed557449c18288bf07241671a43Patch
- https://github.com/benoitc/hackney/security/advisories/GHSA-j9wq-vxxc-94wfExploitPatchVendor Advisory
- https://osv.dev/vulnerability/EEF-CVE-2026-47075PatchThird Party Advisory
- https://github.com/benoitc/hackney/security/advisories/GHSA-j9wq-vxxc-94wfExploitPatchVendor Advisory
FAQ
What is CVE-2026-47075?
CVE-2026-47075 is a vulnerability with a CVSS score of 7.5 (HIGH). Improper Neutralization of CRLF Sequences vulnerability in benoitc hackney allows HTTP Request Splitting. hackney does not percent-encode carriage return (\r) or line feed (\n) characters in the URL q...
How severe is CVE-2026-47075?
CVE-2026-47075 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-47075?
Check the references section above for vendor advisories and patch information. Affected products include: Benoitc Hackney.