EEF-CVE-2026-82728

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EEF-CVE-2026-82728

Summary: Unbounded HTTP/1 status-line and chunk-extension buffering in Mint causes memory-exhaustion DoS

Details: ## Summary Allocation of Resources Without Limits or Throttling vulnerability in elixir-mint mint allows a remote HTTP server to exhaust memory on the client host and cause a denial of service. Two HTTP/1 response-parser states accumulate server data without any cap. In lib/mint/http1.ex, decode\_status\_line/4 stores the unconsumed data in conn.buffer when the status line is incomplete, and decode\_body/5 does the same for an unterminated chunk-extension line. Both wait for a CRLF the server never has to send, and conn.buffer is prepended to every subsequent socket message. The :max\_header\_list\_size budget is wired only into decode\_headers/5 and decode\_trailer\_headers/4, so neither of these states is covered by it. A malicious server, or one reached through an attacker-controlled redirect or a fetched URL, streams bytes indefinitely until the BEAM node is killed by the operating system out-of-memory handler. The chunk-extension variant is reached after a valid status line and a complete, valid header section, so an intermediary inspecting only headers sees an ordinary 200 response. This issue affects mint: from 0.1.0 before 1.10.0.

References: https://github.com/elixir-mint/mint/security/advisories/GHSA-g83f-2j6r-q6m4, https://cna.erlef.org/cves/CVE-2026-82728.html, https://github.com/elixir-mint/mint/commit/19be5558b6a317e271c78666498dd78b151e490a, https://hex.pm/packages/mint