CVE-2026-85664
High
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.
SeverityHigh
CVSS7.5
Exploit probability—
ProductChroma
PublishedSep 4, 2026
First seenSep 4, 2026
Weakness typeCWE-770Allocation of resources without limits
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| chroma-core chroma | v ≤ 1.5.9 | — |
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