High severity7.5NVD Advisory· Published Sep 4, 2026

CVE-2026-85664

Description

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/Chromallm-fuzzy
Range: <1.5.9

Patches

Vulnerability mechanics

References

github.com/chroma-core/chroma/blob/1.5.9/rust/frontend/src/auth/mod.rsnvd
github.com/chroma-core/chroma/blob/1.5.9/rust/types/src/hnsw_configuration.rsnvd
github.com/chroma-core/chroma/issues/7225nvd
www.vulncheck.com/advisories/chroma-1.5.9-unbounded-hnsw-index-parameters-memory-exhaustionnvd

News mentions

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cvss	0.488
epss	0.000
exploit	0.000
kev	0.000
patch	-0.070
ransomware	0.000