Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Benoitc | Hackney | >= 0.9.0, < 4.0.1 |
Related Weaknesses (CWE)
References
- https://cna.erlef.org/cves/CVE-2026-47069.htmlPatchThird Party Advisory
- https://github.com/benoitc/hackney/commit/8e02b99c28aea1b3fa2ddc0e66f51fe5bb0ac5Patch
- https://github.com/benoitc/hackney/security/advisories/GHSA-mp55-p8c9-rfw2ExploitPatchVendor Advisory
- https://osv.dev/vulnerability/EEF-CVE-2026-47069PatchThird Party Advisory
- https://github.com/benoitc/hackney/security/advisories/GHSA-mp55-p8c9-rfw2ExploitPatchVendor Advisory
FAQ
What is CVE-2026-47069?
CVE-2026-47069 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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 validate...
How severe is CVE-2026-47069?
CVE-2026-47069 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-47069?
Check the references section above for vendor advisories and patch information. Affected products include: Benoitc Hackney.