CVE-2026-47075Improper Neutralization of CRLF Sequences vulnerability in benoitc hackney allows HTTP Request Splitting.
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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
- 7.5 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- Weakness (CWE)
- CWE-93
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Modified
- Record last updated
- Jul 24, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
benoitc hackney benoitc:hackney | before 4.0.1 | NVD |
References
- https://cna.erlef.org/cves/CVE-2026-47075.htmlpatch, third-party-advisory
- https://github.com/benoitc/hackney/commit/ca73dd0aba0ed557449c18288bf07241671a43c9patch
- https://github.com/benoitc/hackney/security/advisories/GHSA-j9wq-vxxc-94wfexploit, patch, vendor-advisory
- https://osv.dev/vulnerability/EEF-CVE-2026-47075patch, third-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.