{"id":"EEF-CVE-2026-82728","summary":"Unbounded HTTP/1 status-line and chunk-extension buffering in Mint causes memory-exhaustion DoS","details":"## Summary\n\nAllocation 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.\n\nTwo 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.\n\nThis issue affects mint: from 0.1.0 before 1.10.0.","aliases":["CVE-2026-82728","GHSA-g83f-2j6r-q6m4"],"modified":"2026-09-08T02:45:03.378422872Z","published":"2026-09-04T14:31:30.059Z","database_specific":{"cpe_ids":["cpe:2.3:a:elixir-mint:mint:*:*:*:*:*:*:*:*"],"cwe_ids":["CWE-770"],"capec_ids":["CAPEC-130"]},"references":[{"type":"ADVISORY","url":"https://github.com/elixir-mint/mint/security/advisories/GHSA-g83f-2j6r-q6m4"},{"type":"WEB","url":"https://cna.erlef.org/cves/CVE-2026-82728.html"},{"type":"FIX","url":"https://github.com/elixir-mint/mint/commit/19be5558b6a317e271c78666498dd78b151e490a"},{"type":"PACKAGE","url":"https://hex.pm/packages/mint"}],"affected":[{"package":{"name":"mint","ecosystem":"Hex","purl":"pkg:hex/mint"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0.1.0"},{"fixed":"1.10.0"}]}],"versions":["0.1.0","0.2.0","0.2.1","0.3.0","0.4.0","0.5.0","1.0.0","1.1.0","1.2.0","1.2.1","1.3.0","1.4.0","1.4.1","1.4.2","1.5.0","1.5.1","1.5.2","1.6.0","1.6.1","1.6.2","1.7.0","1.7.1","1.8.0","1.9.0","1.9.1","1.9.2","1.9.3"],"database_specific":{"source":"https://cna.erlef.org/osv/EEF-CVE-2026-82728.json"}},{"ranges":[{"type":"GIT","repo":"https://github.com/elixir-mint/mint","events":[{"introduced":"c088e4b6430545338841ab8d294369e45d39856a"},{"fixed":"19be5558b6a317e271c78666498dd78b151e490a"}]}],"versions":["v1.9.3","v1.9.2","v1.9.1","v1.9.0","v1.8.0","v1.7.1","v1.7.0","v1.6.2","v1.6.1","v1.6.0","v1.5.2","v1.5.1","v1.5.0","v1.4.2","v1.4.1","v1.4.0","v1.3.0","v1.2.1","v1.2.0","v1.1.0","v1.0.0","v0.5.0","v0.4.0","v0.2.1","v0.2.0","v0.1.0"],"database_specific":{"source":"https://cna.erlef.org/osv/EEF-CVE-2026-82728.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"}],"credits":[{"name":"Tr3bor","type":"FINDER"},{"name":"Tr3bor","type":"REPORTER"},{"name":"Andrea Leopardi","type":"REMEDIATION_DEVELOPER"},{"name":"Jonatan Männchen / EEF","type":"COORDINATOR"}]}