CVE-2026-18428

HIGHPre-NVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-08-13. a secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.8Exploit: None knownExposed: 0

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

A SQL query validation bypass in the Flint extension query handler in the OpenSearch SQL plugin allows a remote authenticated actor with async query access to execute arbitrary code on Apache Spark workers by sending a crafted SQL query to the direct query endpoint.

CVSS v3
8.8
EG Score
8.8(high)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity88% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
50%
KEV
Not listed

Published

August 13, 2026

Last Modified

August 14, 2026

Advisory Details (5)

Auto-updated Aug 13, 2026
Patch available. Sources: github.
generic

CVE-2026-18428 OpenSearch SQL Plugin - Async Query Validation Bypass

https://aws.amazon.com/security/security-bulletins/2026-081-aws/
github Patch Available

SQL Query Validation Bypass in OpenSearch Direct Query · Advisory · opensearch-project/sql · GitHub

https://github.com/opensearch-project/sql/security/advisories/GHSA-g4jr-343c-fvjm
generic

Service software updates in Amazon OpenSearch Service - Amazon OpenSearch Service

https://docs.aws.amazon.com/opensearch-service/latest/developerguide/service-software.html
generic

Artifacts By Version - OpenSearch

https://opensearch.org/artifacts/by-version/?_gl=1*d14pqp*_up*MQ..*_ga*Nzc5NTAxNzM2LjE3ODM1NTA2NDA.*_ga_BQV14XK08F*czE3ODM1NTA2NDAkbzEkZzEkdDE3ODM1NTA3MTQkajU2JGwwJGg3NTc4ODY0OTM.#release-2-19-6
generic

Artifacts By Version - OpenSearch

https://opensearch.org/artifacts/by-version/?_gl=1*d14pqp*_up*MQ..*_ga*Nzc5NTAxNzM2LjE3ODM1NTA2NDA.*_ga_BQV14XK08F*czE3ODM1NTA2NDAkbzEkZzEkdDE3ODM1NTA3MTQkajU2JGwwJGg3NTc4ODY0OTM.#release-3-7-0

Vendor Advisories for CVE-2026-18428(2)

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 31× in last 7d / 31× 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. 2026-08-20 06:18 UTCGHSA enrichment
  2. 2026-08-19 18:29 UTCEG score recompute
  3. 2026-08-19 18:29 UTCGHSA enrichment
  4. 2026-08-19 17:03 UTCEPSS rescore
  5. 2026-08-19 06:40 UTCGHSA enrichment
  6. 2026-08-18 18:48 UTCEG score recompute
  7. 2026-08-18 18:48 UTCGHSA enrichment
  8. 2026-08-18 13:48 UTCEPSS rescore
  9. 2026-08-18 06:59 UTCGHSA enrichment
  10. 2026-08-17 19:10 UTCEG score recompute
  11. 2026-08-17 19:10 UTCGHSA enrichment
  12. 2026-08-17 13:47 UTCEPSS rescore
  13. 2026-08-17 06:32 UTCGHSA enrichment
  14. 2026-08-16 18:33 UTCEG score recompute
  15. 2026-08-16 18:33 UTCGHSA enrichment
  16. 2026-08-16 14:56 UTCEPSS rescore
  17. 2026-08-16 06:43 UTCEG score recompute
  18. 2026-08-16 06:43 UTCGHSA enrichment
  19. 2026-08-16 02:14 UTCEPSS rescore
  20. 2026-08-15 18:55 UTCGHSA enrichment
  21. 2026-08-15 07:06 UTCEG score recompute
  22. 2026-08-15 07:06 UTCGHSA enrichment
  23. 2026-08-15 01:30 UTCEPSS rescore
  24. 2026-08-14 19:17 UTCGHSA enrichment
  25. 2026-08-14 17:56 UTCGHSA enrichment
Show 6 more
  1. 2026-08-14 06:07 UTCEG score recompute
  2. 2026-08-14 06:07 UTCGHSA enrichment
  3. 2026-08-13 18:18 UTCEG score recompute
  4. 2026-08-13 18:12 UTCEG score recompute
  5. 2026-08-13 17:47 UTCEG score recompute
  6. 2026-08-13 17:46 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-18428?
CVE-2026-18428 is a high vulnerability published on August 13, 2026. A SQL query validation bypass in the Flint extension query handler in the OpenSearch SQL plugin allows a remote authenticated actor with async query access to execute arbitrary code on Apache Spark workers by sending a crafted SQL query to the direct query endpoint.
When was CVE-2026-18428 disclosed?
CVE-2026-18428 was first published in the National Vulnerability Database on August 13, 2026, with the most recent update on August 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18428 actively exploited?
CVE-2026-18428 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 50.0% of all scored CVEs.
What is the CVSS score of CVE-2026-18428?
CVE-2026-18428 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-18428?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-18428, 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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