CVE-2026-56813— Cookie attribute injection in Plug.Conn.Cookies.encode/2

Cookie attribute injection in Plug.Conn.Cookies.encode/2

Improper Neutralization of Parameter/Argument Delimiters vulnerability in elixir-plug plug allows an attacker to inject or override HTTP cookie attributes. The Plug.Conn.Cookies.encode/2 function in lib/plug/conn/cookies.ex builds the Set-Cookie response header by interpolating the cookie value and its path, domain, same_site, and extra attributes directly into the header without neutralizing the ';' delimiter that separates cookie attributes. An application that places attacker-controlled data into a cookie value or attribute (for example via Plug.Conn.put_resp_cookie/4 when reflecting a username or preference) lets an attacker inject a ';' to append or override cookie attributes (such as Domain and Path scope, or dropping the Secure and HttpOnly flags), enabling cookie tossing and session fixation. Carriage return, line feed, and null bytes are rejected by Plug.Conn header validation, so HTTP response splitting is not possible, but attribute injection through ';' is not prevented. This issue affects plug: from 0.1.0 before 1.16.6, from 1.17.0 before 1.17.4, from 1.18.0 before 1.18.5, from 1.19.0 before 1.19.5, from 1.20.0 before 1.20.3.

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参数分隔符转义处理不恰当

elixir-plug plug 输入验证错误漏洞

elixir-plug plug是elixir-plug团队的一个Web应用程序组件框架。 elixir-plug plug 0.1.0版本至1.16.6之前版本、1.17.0版本至1.17.4之前版本、1.18.0版本至1.18.5之前版本、1.19.0版本至1.19.5之前版本和1.20.0版本至1.20.3之前版本存在输入验证错误漏洞，该漏洞源于对参数/参数分隔符的中和不当，允许攻击者注入或覆盖HTTP cookie属性。

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