CVE-2026-85664 json
Chroma 1.5.9 Unbounded HNSW Index Parameters Memory Exhaustion
published 2026-09-04 2 mo ago modified 2026-09-10 59 d ago also EUVD-2026-71120
- cvss
- 7.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.7%
- EPSS 0.7% chance of exploitation in 30 days, percentile 51%
- public exploits
- 0
- none known
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.
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 59 d ago
Exploit prediction
0.66% chance of exploitation in the next 30 days, higher than 51% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 8.7 | 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 |
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| CNA | 4.0 | 8.7 | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
Affected products
- chroma-core chroma
Classification
- Weakness
-
- CWE-770 Allocation of Resources Without Limits or Throttling
References
-
github.com
/chroma-core/chroma/issues/7225
issue-tracking
-
github.com
/chroma-core/chroma
product
-
github.com
/chroma-core/chroma/blob/1.5.9/rust/types/src/hnsw_configuration.rs
technical-description
-
github.com
/chroma-core/chroma/blob/1.5.9/rust/frontend/src/auth/mod.rs
technical-description
-
vulncheck.com
/advisories/chroma-1.5.9-unbounded-hnsw-index-parameters-memory-exhaustion
third-party-advisory
Sources
- CVE List CVE-2026-85664
- NVD CVE-2026-85664
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