Bug 2531492 (CVE-2026-85664)

Summary: CVE-2026-85664 chroma-core: github.com/chroma-core/chroma: Chroma: Denial of service via unbounded HNSW index parameters.
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerability-draftAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: anjoseph, dfreiber, drow, eglynn, gparvin, jburrell, jjoyce, jprabhak, jpretori, jschluet, lhh, mburns, mgarciac, rhaigner, vkumar, wtam
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Chroma. Unauthenticated attackers can exploit this vulnerability by providing excessively large parameters during collection creation. This can lead to the exhaustion of server memory, resulting in a denial of service during index compaction.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Description OSIDB Bzimport 2026-09-10 15:21:29 UTC
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.