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

Quick assessment

Affected
elixir-plug plug
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 2.1 · Low EPSS 0.22% · P11

Affected Version Matrix 6

VendorProduct Version RangeStatus
elixir-plug plug 0.1.0< 1.16.6 affected
1.17.0< 1.17.4 affected
1.18.0< 1.18.5 affected
1.19.1< 1.19.5 affected
1.20.0< 1.20.3 affected
f26876aa67aaeb38e616638aa3efbcc2fe2906a5< * affected
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I. Basic Information for CVE-2026-56813

Vulnerability Information
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Vulnerability Title
Cookie attribute injection in Plug.Conn.Cookies.encode/2
Source: CVE Program / CVE List V5
Vulnerability Description
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 1.19.1 before 1.19.5, and from 1.20.0 before 1.20.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
参数分隔符转义处理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
elixir-plug plug 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
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。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
elixir-plug plug 0.1.0 ~ 1.16.6 cpe:2.3:a:elixir-plug:plug:*:*:*:*:*:*:*:*
elixir-plug plug f26876aa67aaeb38e616638aa3efbcc2fe2906a5 ~ * cpe:2.3:a:elixir-plug:plug:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-56813

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III. Intelligence Information for CVE-2026-56813

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Patches & Fixes for CVE-2026-56813 (7)

Vendor Advisories for CVE-2026-56813 (3)

IV. Related Vulnerabilities

Same product: plug
Same vendor: elixir-plug
Same weakness: CWE-141

V. Comments for CVE-2026-56813

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