CVE-2026-85664

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.

Score

CVSS 4.0 8.7 High

Status

Deferred - disclosure@vulncheck.com

Published

2026-09-04

Last modified

2026-09-10

Weaknesses

CWE-770

Affected products

• Chroma (Chroma-core)

References

• https://github.com/chroma-core/chroma
• https://github.com/chroma-core/chroma/blob/1.5.9/rust/frontend/src/auth/mod.rs
• https://github.com/chroma-core/chroma/blob/1.5.9/rust/types/src/hnsw_configuration.rs
• https://github.com/chroma-core/chroma/issues/7225
• https://www.vulncheck.com/advisories/chroma-1.5.9-unbounded-hnsw-index-parameters-memory-exhaustion