CVE-2026-85664
Medium
Elevated severity or exploit probability.
CVSS base
7.5
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS — probability of exploitation (30 days)
0.7%
49.4th percentile
CISA KEV
Not listed
Weakness / dates
CWE-770
Published 2026-09-04 · modified 2026-09-10
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.
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