CVE-2026-47069

CRLF injection in cookie domain/path options in hackney

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.

Scores

Faiblesses (CWE)

• CWE-93

Références européennes

• ENISA EUVD · EUVD-2026-31683
• GCVE · GCVE-0-2026-47069

Configurations affectées (CPE NVD)

• cpe:2.3:a:benoitc:hackney:*:*:*:*:*:*:*:* ≥ 0.9.0 < 4.0.1

Produits affectés

Références

• https://github.com/benoitc/hackney/security/advisories/GHSA-mp55-p8c9-rfw2
• https://cna.erlef.org/cves/CVE-2026-47069.html
• https://osv.dev/vulnerability/EEF-CVE-2026-47069
• https://github.com/benoitc/hackney/commit/8e02b99c28aea1b3fa2ddc0e66f51fe5bb0ac540

Sources