CVE-2026-43969 Cookie Request Header Injection via Unvalidated Encoder in cow_cookie:cookie/1

Improper Neutralization of CRLF Sequences 'CRLF Injection' vulnerability in ninenines cowlib allows HTTP request splitting and cookie smuggling via unvalidated cookie name and value fields. cowcookie:cookie/1 in cowlib builds a client-side Cookie: request header from a list of name-value pairs...

CVE-2026-43969

CVE-2026-43969 affects the Erlang/Elixir cowlib project (cow_cookie:cookie/1). The encoder builds a client-side Cookie header from name-value pairs without validating characters, allowing an attacker-controlled cookie name or value to inject CR, LF, semicolon, comma, or TAB. This enables cookie s...