CVE-2026-85664

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-04. a secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
7.5
EG Score
7.5(high)
EG Risk
49(Track)
EG Risk 49/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
30%
KEV
Not listed

Published

September 4, 2026

Last Modified

September 10, 2026

Advisory Details (5)

Auto-updated Sep 4, 2026
No patch confirmed yet.
generic

Chroma 1.5.9 Unbounded HNSW Index Parameters Memory Exhaustion | Advisories | VulnCheck

https://www.vulncheck.com/advisories/chroma-1.5.9-unbounded-hnsw-index-parameters-memory-exhaustion
generic

chroma/rust/frontend/src/auth/mod.rs at 1.5.9 · chroma-core/chroma · GitHub

https://github.com/chroma-core/chroma/blob/1.5.9/rust/frontend/src/auth/mod.rs
generic

chroma/rust/types/src/hnsw_configuration.rs at 1.5.9 · chroma-core/chroma · GitHub

https://github.com/chroma-core/chroma/blob/1.5.9/rust/types/src/hnsw_configuration.rs
generic

GitHub - chroma-core/chroma: Search infrastructure for AI · GitHub

https://github.com/chroma-core/chroma
generic

[Security]: Unbounded HNSW `max_neighbors` (and `ef_construction`/`ef_search`) → memory-exhaustion / compaction-worker-crash DoS · Issue #7225 · chroma-core/chroma · GitHub

https://github.com/chroma-core/chroma/issues/7225

Vendor Advisories for CVE-2026-85664(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 28× in last 7d / 67× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-21 00:19 UTCEG score recompute
  2. 2026-09-21 00:18 UTCGHSA enrichment
  3. 2026-09-20 20:16 UTCEPSS rescore
  4. 2026-09-20 12:30 UTCGHSA enrichment
  5. 2026-09-20 00:33 UTCEG score recompute
  6. 2026-09-20 00:33 UTCGHSA enrichment
  7. 2026-09-19 12:46 UTCGHSA enrichment
  8. 2026-09-19 00:58 UTCEG score recompute
  9. 2026-09-19 00:58 UTCGHSA enrichment
  10. 2026-09-18 19:28 UTCEPSS rescore
  11. 2026-09-18 13:11 UTCGHSA enrichment
  12. 2026-09-18 01:24 UTCEG score recompute
  13. 2026-09-18 01:24 UTCGHSA enrichment
  14. 2026-09-17 19:32 UTCEPSS rescore
  15. 2026-09-17 13:37 UTCGHSA enrichment
  16. 2026-09-17 01:49 UTCEG score recompute
  17. 2026-09-17 01:49 UTCGHSA enrichment
  18. 2026-09-16 14:09 UTCEPSS rescore
  19. 2026-09-16 14:02 UTCEG score recompute
  20. 2026-09-16 14:02 UTCGHSA enrichment
  21. 2026-09-16 05:15 UTCEPSS rescore
  22. 2026-09-16 02:14 UTCGHSA enrichment
  23. 2026-09-15 14:27 UTCEG score recompute
  24. 2026-09-15 14:27 UTCGHSA enrichment
  25. 2026-09-15 03:12 UTCEPSS rescore
Show 42 more
  1. 2026-09-15 03:12 UTCEPSS rescore
  2. 2026-09-15 02:39 UTCGHSA enrichment
  3. 2026-09-14 14:52 UTCGHSA enrichment
  4. 2026-09-14 03:05 UTCEG score recompute
  5. 2026-09-14 03:05 UTCGHSA enrichment
  6. 2026-09-13 15:18 UTCGHSA enrichment
  7. 2026-09-13 03:31 UTCGHSA enrichment
  8. 2026-09-12 15:43 UTCEG score recompute
  9. 2026-09-12 15:43 UTCGHSA enrichment
  10. 2026-09-12 03:56 UTCGHSA enrichment
  11. 2026-09-11 16:08 UTCEG score recompute
  12. 2026-09-11 16:08 UTCGHSA enrichment
  13. 2026-09-11 14:53 UTCEPSS rescore
  14. 2026-09-11 14:53 UTCEPSS rescore
  15. 2026-09-11 04:13 UTCGHSA enrichment
  16. 2026-09-10 16:26 UTCGHSA enrichment
  17. 2026-09-10 15:59 UTCEG score recompute
  18. 2026-09-10 15:59 UTCGHSA enrichment
  19. 2026-09-10 15:28 UTCEG score recompute
  20. 2026-09-10 15:28 UTCGHSA enrichment
  21. 2026-09-10 03:54 UTCGHSA enrichment
  22. 2026-09-09 16:06 UTCGHSA enrichment
  23. 2026-09-09 04:12 UTCEG score recompute
  24. 2026-09-09 04:12 UTCGHSA enrichment
  25. 2026-09-08 22:01 UTCEPSS rescore
  26. 2026-09-08 16:19 UTCGHSA enrichment
  27. 2026-09-08 02:32 UTCEG score recompute
  28. 2026-09-08 02:32 UTCGHSA enrichment
  29. 2026-09-07 14:44 UTCGHSA enrichment
  30. 2026-09-07 02:26 UTCGHSA enrichment
  31. 2026-09-06 14:35 UTCEG score recompute
  32. 2026-09-06 14:35 UTCGHSA enrichment
  33. 2026-09-06 13:48 UTCEPSS rescore
  34. 2026-09-06 02:48 UTCEG score recompute
  35. 2026-09-06 02:48 UTCGHSA enrichment
  36. 2026-09-05 15:31 UTCEPSS rescore
  37. 2026-09-05 15:01 UTCGHSA enrichment
  38. 2026-09-05 03:11 UTCEG score recompute
  39. 2026-09-05 03:10 UTCGHSA enrichment
  40. 2026-09-04 15:23 UTCEG score recompute
  41. 2026-09-04 14:45 UTCEG score recompute
  42. 2026-09-04 14:44 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-85664?
CVE-2026-85664 is a high vulnerability published on September 4, 2026. Chroma 1.5.9 fails to validate maximum bounds on HNSW index parameters maxneighbors, efconstruction, 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.
When was CVE-2026-85664 disclosed?
CVE-2026-85664 was first published in the National Vulnerability Database on September 4, 2026, with the most recent update on September 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-85664 actively exploited?
CVE-2026-85664 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 69.6% of all scored CVEs.
What is the CVSS score of CVE-2026-85664?
CVE-2026-85664 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-85664?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-85664, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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