{"id":"CVE-2026-85664","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-85664","summary":"Chroma 1.5.9 fails to validate maximum bounds on HNSW index parameters max_neighbors, ef_construction, and ef_search in collection-create requests. Unauthenticated attackers can supply…","details":"Chroma 1.5.9 fails to validate maximum bounds on HNSW index parameters max_neighbors, ef_construction, and ef_search in collection-create requests. Unauthenticated attackers can supply arbitrarily large parameter values to exhaust server memory and cause denial of service during index compaction.","published":"2026-09-04T15:17:44.097","modified":"2026-09-04T15:17:44.097","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":null,"references":[{"type":"WEB","url":"https://github.com/chroma-core/chroma"},{"type":"WEB","url":"https://github.com/chroma-core/chroma/blob/1.5.9/rust/frontend/src/auth/mod.rs"},{"type":"WEB","url":"https://github.com/chroma-core/chroma/blob/1.5.9/rust/types/src/hnsw_configuration.rs"},{"type":"WEB","url":"https://github.com/chroma-core/chroma/issues/7225"},{"type":"WEB","url":"https://www.vulncheck.com/advisories/chroma-1.5.9-unbounded-hnsw-index-parameters-memory-exhaustion"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-09-04T15:17:44.097"}}