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    <lastBuildDate>Mon, 05 Oct 2026 13:02:48 +0000</lastBuildDate>
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      <title>CVE-2026-32688 — Atom table exhaustion via HTTP/2 :scheme pseudo-header in plug_cowboy</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2026-32688</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; elixir-plug plug_cowboy&lt;/p&gt;
&lt;p&gt;Allocation of Resources Without Limits or Throttling vulnerability in elixir-plug plug_cowboy allows unauthenticated remote denial of service via atom table exhaustion.&lt;/p&gt;
&lt;p&gt;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.&lt;/p&gt;
&lt;p&gt;This vulnerability does not affect HTTP/1.1, where cowboy derives the scheme from the listener type rather than from a client-supplied header.&lt;/p&gt;
&lt;p&gt;This issue affects plug_cowboy: from 2.0.0 before 2.8.1.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; elixir-plug plug_cowboy&lt;/p&gt;
&lt;p&gt;Allocation of Resources Without Limits or Throttling vulnerability in elixir-plug plug_cowboy allows unauthenticated remote denial of service via atom table exhaustion.&lt;/p&gt;
&lt;p&gt;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.&lt;/p&gt;
&lt;p&gt;This vulnerability does not affect HTTP/1.1, where cowboy derives the scheme from the listener type rather than from a client-supplied header.&lt;/p&gt;
&lt;p&gt;This issue affects plug_cowboy: from 2.0.0 before 2.8.1.&lt;/p&gt;</content:encoded>
      <guid isPermaLink="false">https://cve.radiocsirt.org/vuln/cve-2026-32688</guid>
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