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NVD 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.
Priority
LOW
Exploitation
NONE
PoC
NONE
Patch
AVAILABLE
Momentum
STABLE
If you run products in this scope, you should treat this CVE as relevant to your environment.
| Date | Total | Labels |
|---|
| 2026-04-27 | 3 | Disclosure3 |
| 2026-05-06 | 1 | Disclosure1 |
🔴 PlugCowboy, Unauthenticated Remote DoS via HTTP/2 Atom-Table Exhaustion, #CVE-2026-32688 (High) https://dailycve.com/plugcowboy-unauthenticated-remote-dos-via-http-2-atom-table-exhaustion-cve-2026-32688-high/
Post summary
CVE‑2026‑32688 was disclosed as a high‑severity unauthenticated remote DoS vulnerability affecting HTTP/2 atom‑table handling, but the post contains no proof‑of‑concept, exploit code, or patch information.
CVE-2026-32688 Unauthenticated Remote Denial of Service via Atom Table Exhaustion in Elixir-Plug Plug_Cowboy https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-32688
Post summary
Announces a remote DoS vulnerability (CVE-2026-32688) caused by Atom Table exhaustion in Elixir‑Plug Plug_Cowboy, without providing exploitation details or mitigation.
CVE-2026-32688 Allocation of Resources Without Limits or Throttling vulnerability in elixir-plug plug_cowboy allows unauthenticated remote denial of service via atom table exhaustio… https://www.cve.org/CVERecord?id=CVE-2026-32688
Post summary
The post announces CVE‑2026‑32688, a remote denial‑of‑service vulnerability in elixir‑plug plug_cowboy caused by resource exhaustion, but provides no PoC, patch, or active exploitation details.
[Phoenix Chat] CVE-2026-32688 --- DoS: Atom table exhaustion via HTTP/2 :scheme pseudo-header in plug_cowboy https://elixirforum.com/t/75147 #PhoenixFramework #ElixirLang #WeBeamTogether #MyElixirStatus
Post summary
The tweet discloses CVE‑2026‑32688 as a denial‑of‑service flaw in plug_cowboy triggered by an HTTP/2 :scheme pseudo‑header, leading to atom table exhaustion. It provides technical details but no PoC, exploit code, or patch information.
1 of 1 entries
| Part | Vendor | Product | Version | Target SW | Target HW |
|---|---|---|---|---|---|
| App | elixir-plug | plug.cowboy | - | - | - |