{"id":"CVE-2026-85664","summary":"Chroma 1.5.9 Unbounded HNSW Index Parameters Memory Exhaustion","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.","modified":"2026-09-06T03:47:20.440660200Z","published":"2026-09-04T14:32:20.917Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/85xxx/CVE-2026-85664.json","cna_assigner":"VulnCheck","cwe_ids":["CWE-770"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/85xxx/CVE-2026-85664.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-85664"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/chroma-1.5.9-unbounded-hnsw-index-parameters-memory-exhaustion"},{"type":"REPORT","url":"https://github.com/chroma-core/chroma/issues/7225"},{"type":"PACKAGE","url":"https://github.com/chroma-core/chroma"},{"type":"ARTICLE","url":"https://github.com/chroma-core/chroma/blob/1.5.9/rust/frontend/src/auth/mod.rs"},{"type":"ARTICLE","url":"https://github.com/chroma-core/chroma/blob/1.5.9/rust/types/src/hnsw_configuration.rs"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/chroma-core/chroma","events":[{"introduced":"0"},{"last_affected":"a0a3c35217f2252870331dfd7b91590131fdad10"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"last_affected":"1.5.9"}],"source":"AFFECTED_FIELD"}}],"versions":["js_release_1.5.9","0.4.10","0.4.9","js_release_1.5.8","js_release_alpha_1.5.7","js_release_1.5.7","0.4.8","0.4.7","0.4.6","0.4.5","0.4.4","0.4.3","0.4.2","0.4.1","0.4.0","0.3.29","0.3.28","0.3.27","0.3.26","0.3.25","0.3.24","0.3.23","0.3.22","0.3.21","0.3.19","0.3.18","0.3.15","0.3.16","0.3.14","0.3.13","0.3.12","0.3.11","0.3.9","0.3.10","0.3.8","0.3.7","0.3.6","0.3.5","0.3.4","0.3.3","0.3.2","0.3.1","0.3.0","0.2.0","0.1.0","0.0.2"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-85664.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"}]}