CVE-2026-47069

Improper Neutralization of CRLF Sequences ('CRLF Injection') vulnerability in benoitc hackney allows HTTP Response Splitting. The hackney_cookie:setcookie/3 function in src/hackney_cookie.erl validates the Name and Value arguments against CRLF and control characters, but concatenates the domain and path options verbatim into the output iolist with no equivalent check. An attacker who controls either option — for example by supplying a Host header value forwarded as the cookie domain, or a request path forwarded as the cookie path — can inject a literal CRLF sequence and arbitrary additional Set-Cookie headers into the HTTP response. This issue affects hackney: from 0.9.0 before 4.0.1.

• CWE-93

• https://cna.erlef.org/cves/CVE-2026-47069.htmlPatch, Third Party Advisory
• https://github.com/benoitc/hackney/commit/8e02b99c28aea1b3fa2ddc0e66f51fe5bb0ac540Patch
• https://github.com/benoitc/hackney/security/advisories/GHSA-mp55-p8c9-rfw2Exploit, Patch, Vendor Advisory
• https://osv.dev/vulnerability/EEF-CVE-2026-47069Patch, Third Party Advisory
• https://github.com/benoitc/hackney/security/advisories/GHSA-mp55-p8c9-rfw2Exploit, Patch, Vendor Advisory

Published

May 25, 2026

Last Modified

Jul 24, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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