Threats Tagged 'cve-2026-32688'
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Threats Tagged 'cve-2026-32688'
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CVE-2026-32688: CWE-770 Allocation of Resources Without Limits or Throttling in elixir-plug plug_cowboyCVE-2026-32688 0 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. Join the discussion | CVE Database V5 | 04/27/2026, 13:45:35 UTC Added: 04/27/2026, 14:15:50 UTC |
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