CVE-2026-85664 Chroma 1.5.9 Unbounded HNSW Index Parameters Memory Exhaustion

Chroma 1.5.9 fails to validate maximum bounds on HNSW index parameters maxneighbors, efconstruction, and efsearch in collection-create requests. Unauthenticated attackers can supply arbitrarily large parameter values to exhaust server memory and cause denial of service during index compaction...