CVE-2026-85664Chroma 1.5.9 Unbounded HNSW Index Parameters Memory Exhaustion
Updated under an hour ago ()
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It affects chroma-core chroma. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-770
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Deferred
- Record last updated
- Sep 10, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
chroma-core chroma chroma_core:chroma (from the name) | through 1.5.9 | CNA record |
References
- https://github.com/chroma-core/chroma/issues/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
- https://www.vulncheck.com/advisories/chroma-1.5.9-unbounded-hnsw-index-parameters-memory-exhaustionthird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.