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Chroma ChromaChroma 1.5.9 Unbounded HNSW Index Parameters Memory Exhaustion

Risk 47
Severity
8.7
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

First published (updated )
CVE-2026-85664

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