High [CVE-2026-85664] Denial of service via unbounded HNSW index parameters.
This high-severity Red Hat Linux advisory covers CVE-2026-85664 affecting Multicluster Global Hub, Red Hat Advanced Cluster Management for Kubernetes 2, Red Hat OpenShift GitOps.
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Summary
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.
A flaw was found in Chroma. Unauthenticated attackers can exploit this vulnerability by providing excessively large parameters during collection creation.
Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-1284.
Affected Red Hat products: Multicluster Global Hub; Red Hat Advanced Cluster Management for Kubernetes 2; Red Hat OpenShift GitOps; Red Hat OpenStack Platform 18.0. Red Hat lists Red Hat Hardened Images as not affected.
Red Hat does not currently list a fixing RHSA for this CVE.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · medium-confidence parse· fetched 45 minutes ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 45 minutes ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 45 minutes ago·verify at source
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