CVE-2026-32688— Atom table exhaustion via HTTP/2 :scheme pseudo-header in plug_cowboy
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I. Basic Information for CVE-2026-32688
Vulnerability Information
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Vulnerability Title
Atom table exhaustion via HTTP/2 :scheme pseudo-header in plug_cowboy
Source: NVD (National Vulnerability Database)
Vulnerability Description
Allocation of Resources Without Limits or Throttling vulnerability in elixir-plug plug_cowboy allows unauthenticated remote denial of service via atom table exhaustion. Plug.Cowboy.Conn.conn/1 in lib/plug/cowboy/conn.ex calls String.to_atom/1 on the value returned by :cowboy_req.scheme/1. For HTTP/2 connections, cowlib passes the client-supplied :scheme pseudo-header value through verbatim without validation. Each unique value permanently allocates a new entry in the BEAM atom table. Since atoms are never garbage-collected and the atom table has a fixed limit (default 1,048,576), an unauthenticated attacker can exhaust the table by sending HTTP/2 requests with unique :scheme values, causing the Erlang VM to abort with system_limit and taking down the entire node. This vulnerability does not affect HTTP/1.1, where cowboy derives the scheme from the listener type rather than from a client-supplied header. This issue affects plug_cowboy: from 2.0.0 before 2.8.1.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
不加限制或调节的资源分配
Source: NVD (National Vulnerability Database)
Vulnerability Title
elixir-plug Plug.Cowboy 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
elixir-plug Plug.Cowboy是elixir-plug公司的一个Web服务器的配置器工具。 elixir-plug Plug.Cowboy 2.0.0版本至2.8.1之前版本存在安全漏洞，该漏洞源于资源分配无限制，可能导致未经身份验证的远程攻击者通过原子表耗尽造成拒绝服务。
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_cowboy | 2.0.0 ~ 2.8.1 | cpe:2.3:a:elixir-plug:plug_cowboy:*:*:*:*:*:*:*:* | |
| elixir-plug | plug_cowboy | 12ecfd024bb179d48b018fecf074e43fe6a19c83 ~ bfb34cb45eb354e56437f7023fb306de1bf9c19b | cpe:2.3:a:elixir-plug:plug_cowboy:*:*:*:*:*:*:*:* |
II. Public POCs for CVE-2026-32688
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|---|
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IV. Related Vulnerabilities
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