CVE-2026-85664
Chroma 1.5.9 Unbounded HNSW Index Parameters Memory Exhaustion
- State
- Published
- Severity
- 8.7 High
- Published
- Sep 4, 2026
- Updated
- Sep 10, 2026
- Reserved
- Sep 4, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.7 High | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | VulnCheck |
Weaknesses
- CWE-770 Allocation of Resources Without Limits or Throttling
Affected Products
| Product | Versions |
|---|---|
chromachroma-core |
|
References
- GitHub Issue #7225issue-tracking
- https://github.com/chroma-core/chromaproduct
- https://github.com/chroma-core/chroma/blob/1.5.9/rust/types/src/hnsw_configuration.rstechnical-description
- https://github.com/chroma-core/chroma/blob/1.5.9/rust/frontend/src/auth/mod.rstechnical-description
- VulnCheck Advisory: Chroma 1.5.9 Unbounded HNSW Index Parameters Memory Exhaustionthird-party-advisory
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