{"id":"CVE-2026-97200","summary":"Unbounded response body buffering and decompression in hackney","details":"Allocation of Resources Without Limits or Throttling vulnerability in hackney_conn in benoitc hackney allows a malicious HTTP server to exhaust client memory via an oversized or highly compressed response body. hackney:request/5 and hackney:body/1 return the whole response body, and nothing bounds how much the connection process buffers. Any server the client requests can trigger it.\n\nhackney_conn:read_full_body/2 and the HTTP/2 and HTTP/3 accumulators append every chunk until the body ends. With {auto_decompress, true} the buffered body is then inflated in one step with zlib:gunzip/1 or zlib:inflate/2, which return the whole output at once.\n\nThis issue affects hackney: from 2.0.0-beta.1 before 4.9.0.","aliases":["EEF-CVE-2026-97200"],"modified":"2026-10-29T02:48:34.374966860Z","published":"2026-10-26T13:49:40.392Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/97xxx/CVE-2026-97200.json","cna_assigner":"EEF","cwe_ids":["CWE-409","CWE-770"]},"references":[{"type":"WEB","url":"https://cna.erlef.org/cves/CVE-2026-97200.html"},{"type":"WEB","url":"https://github.com"},{"type":"WEB","url":"https://osv.dev/vulnerability/EEF-CVE-2026-97200"},{"type":"WEB","url":"https://repo.hex.pm"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/97xxx/CVE-2026-97200.json"},{"type":"ADVISORY","url":"https://github.com/benoitc/hackney/releases/tag/4.9.0"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-97200"},{"type":"FIX","url":"https://github.com/benoitc/hackney/commit/493e8bf83a391548e5101792276ab3fc428fa76c"},{"type":"FIX","url":"https://github.com/benoitc/hackney/commit/dc41b79339ca0c41e16d3f2dd17172bc2de855d6"},{"type":"FIX","url":"https://github.com/benoitc/hackney/pull/980"},{"type":"PACKAGE","url":"https://github.com/benoitc/hackney"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/benoitc/hackney","events":[{"introduced":"dc41b79339ca0c41e16d3f2dd17172bc2de855d6"},{"fixed":"493e8bf83a391548e5101792276ab3fc428fa76c"},{"introduced":"e0f288721bb99f4f423172f7321875fcbc96ff86"},{"fixed":"0f5db333d43600e7b9fb9346143b4e9fdb8924ea"},{"fixed":"dc41b79339ca0c41e16d3f2dd17172bc2de855d6"}],"database_specific":{"extracted_events":[{"source":"AFFECTED_FIELD","strategy":"StandardRange","range":[{"introduced":"dc41b79339ca0c41e16d3f2dd17172bc2de855d6"},{"fixed":"493e8bf83a391548e5101792276ab3fc428fa76c"}]},{"source":"AFFECTED_FIELD","strategy":"StandardRange","range":[{"introduced":"2.0.0-beta.1"},{"fixed":"4.9.0"}]},{"source":"REFERENCES_TAG","original_tag":"4.9.0","range":[{"fixed":"0f5db333d43600e7b9fb9346143b4e9fdb8924ea"}]},{"range":[{"fixed":"dc41b79339ca0c41e16d3f2dd17172bc2de855d6"}],"source":"REFERENCES_COMMIT"},{"source":"REFERENCES_COMMIT","range":[{"fixed":"493e8bf83a391548e5101792276ab3fc428fa76c"}]}]}}],"versions":["4.8.7","4.8.6","4.8.5","4.8.4","4.8.3","4.8.2","4.8.1","4.8.0","4.7.4","4.7.3","4.7.2","4.7.1","4.7.0","4.6.1","4.6.0","4.5.2","4.5.1","4.5.0","4.4.5","4.4.4","4.4.3","4.4.2","4.4.1","4.4.0","4.3.0","4.2.3","4.2.2","4.2.1","4.2.0","4.1.0","4.0.3","4.0.2","4.0.1","4.0.0","3.2.1","3.2.0","3.1.2","3.1.1","3.1.0","3.0.3","3.0.2","3.0.1","2.0.1","2.0.0","2.0.0-beta.1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-97200.json"}}],"schema_version":"1.9.2","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"}]}