CR/LF injection in query parameter in hackney_CVE-2026-47075

6.8 / 10

MEDIUM

CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N

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 before 4.0.1.

Basic Information

ID CVE-2026-47075

Source EEF

Published May 25, 2026 at 14:00

Affected Product

Vendor benoitc

Product hackney

Affected Versions benoitc hackney 0
benoitc hackney 8bb1a359a81ae58567c84f8d24564e9742e6f2bd

CWE Classification

CWE-93

References

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    "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.\n\nThis issue affects hackney: from 0 before 4.0.1.",
    "published": "2026-05-25T14:00:45.781Z",
    "modified": "2026-05-25T14:00:45.781Z",
    "type": "cve",
    "title": "CR/LF injection in query parameter in hackney",
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    "references": "https://github.com/benoitc/hackney/security/advisories/GHSA-j9wq-vxxc-94wf\nhttps://cna.erlef.org/cves/CVE-2026-47075.html\nhttps://osv.dev/vulnerability/EEF-CVE-2026-47075\nhttps://github.com/benoitc/hackney/commit/ca73dd0aba0ed557449c18288bf07241671a43c9",
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