CVE-2026-85664: Chroma-Core Chroma

High severity, CVSS 7.5. EPSS: 0.7% chance of exploitation in the next 30 days.

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.

Affected products

• Chroma-Core Chroma: up to and including 1.5.9

Published 2026-09-04. Last modified 2026-09-10.