Home

Description

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.

PUBLISHED Reserved 2026-05-18 | Published 2026-05-25 | Updated 2026-05-27 | Assigner EEF




LOW: 2.1CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N

Problem types

CWE-93 Improper Neutralization of CRLF Sequences ('CRLF Injection')

Product status

Default status
unaffected

0.9.0 (semver) before 4.0.1
affected

Default status
unaffected

602d5c7f2ea4acbc83ed75230655d935a0750ebc (git) before 8e02b99c28aea1b3fa2ddc0e66f51fe5bb0ac540
affected

Credits

Peter Ullrich finder

Benoit Chesneau remediation developer

Jonatan Männchen / EEF analyst

References

github.com/...ackney/security/advisories/GHSA-mp55-p8c9-rfw2 exploit

github.com/...ackney/security/advisories/GHSA-mp55-p8c9-rfw2 vendor-advisory related

cna.erlef.org/cves/CVE-2026-47069.html related

osv.dev/vulnerability/EEF-CVE-2026-47069 related

github.com/...ommit/8e02b99c28aea1b3fa2ddc0e66f51fe5bb0ac540 patch

cve.org (CVE-2026-47069)

nvd.nist.gov (CVE-2026-47069)

Download JSON