CVE-2026-18428

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM 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 — 3 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(medium)
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
51%
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 25× in last 7d / 107× 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.

Showing the most recent 100 of 138 total refreshes for this CVE.

  1. 2026-09-19 00:39 UTCEG score recompute
  2. 2026-09-19 00:39 UTCGHSA enrichment
  3. 2026-09-18 19:27 UTCEPSS rescore
  4. 2026-09-18 12:49 UTCGHSA enrichment
  5. 2026-09-18 00:27 UTCEG score recompute
  6. 2026-09-18 00:27 UTCGHSA enrichment
  7. 2026-09-17 12:01 UTCGHSA enrichment
  8. 2026-09-16 23:59 UTCEG score recompute
  9. 2026-09-16 23:59 UTCGHSA enrichment
  10. 2026-09-16 14:07 UTCEPSS rescore
  11. 2026-09-16 05:14 UTCEPSS rescore
  12. 2026-09-16 05:03 UTCGHSA enrichment
  13. 2026-09-15 16:15 UTCGHSA enrichment
  14. 2026-09-15 04:26 UTCEG score recompute
  15. 2026-09-15 04:26 UTCGHSA enrichment
  16. 2026-09-14 16:36 UTCGHSA enrichment
  17. 2026-09-14 04:47 UTCGHSA enrichment
  18. 2026-09-13 16:58 UTCEG score recompute
  19. 2026-09-13 16:58 UTCGHSA enrichment
  20. 2026-09-13 16:46 UTCEPSS rescore
  21. 2026-09-13 05:09 UTCEG score recompute
  22. 2026-09-13 05:09 UTCGHSA enrichment
  23. 2026-09-12 17:20 UTCEG score recompute
  24. 2026-09-12 17:20 UTCGHSA enrichment
  25. 2026-09-12 15:00 UTCEPSS rescore
Show 75 more
  1. 2026-09-12 05:31 UTCGHSA enrichment
  2. 2026-09-11 17:42 UTCEG score recompute
  3. 2026-09-11 17:42 UTCGHSA enrichment
  4. 2026-09-11 14:52 UTCEPSS rescore
  5. 2026-09-11 09:36 UTCEPSS rescore
  6. 2026-09-11 05:17 UTCGHSA enrichment
  7. 2026-09-10 17:28 UTCEG score recompute
  8. 2026-09-10 17:28 UTCGHSA enrichment
  9. 2026-09-10 09:34 UTCEPSS rescore
  10. 2026-09-10 05:32 UTCGHSA enrichment
  11. 2026-09-09 17:43 UTCGHSA enrichment
  12. 2026-09-09 04:56 UTCEG score recompute
  13. 2026-09-09 04:56 UTCGHSA enrichment
  14. 2026-09-08 22:00 UTCEPSS rescore
  15. 2026-09-08 06:18 UTCGHSA enrichment
  16. 2026-09-07 17:33 UTCEG score recompute
  17. 2026-09-07 17:33 UTCGHSA enrichment
  18. 2026-09-07 16:01 UTCEPSS rescore
  19. 2026-09-07 05:44 UTCGHSA enrichment
  20. 2026-09-06 15:24 UTCEG score recompute
  21. 2026-09-06 15:24 UTCGHSA enrichment
  22. 2026-09-06 13:47 UTCEPSS rescore
  23. 2026-09-06 03:29 UTCGHSA enrichment
  24. 2026-09-05 15:39 UTCEG score recompute
  25. 2026-09-05 15:39 UTCGHSA enrichment
  26. 2026-09-05 03:43 UTCGHSA enrichment
  27. 2026-09-04 15:54 UTCEG score recompute
  28. 2026-09-04 15:54 UTCGHSA enrichment
  29. 2026-09-04 05:06 UTCEPSS rescore
  30. 2026-09-04 04:05 UTCGHSA enrichment
  31. 2026-09-03 16:13 UTCGHSA enrichment
  32. 2026-09-03 01:02 UTCEG score recompute
  33. 2026-09-03 01:02 UTCGHSA enrichment
  34. 2026-09-02 14:11 UTCEPSS rescore
  35. 2026-09-02 13:07 UTCGHSA enrichment
  36. 2026-09-01 23:09 UTCEG score recompute
  37. 2026-09-01 23:09 UTCGHSA enrichment
  38. 2026-09-01 13:53 UTCEPSS rescore
  39. 2026-09-01 11:19 UTCEG score recompute
  40. 2026-09-01 11:19 UTCGHSA enrichment
  41. 2026-09-01 04:39 UTCEPSS rescore
  42. 2026-08-31 21:33 UTCGHSA enrichment
  43. 2026-08-31 07:52 UTCGHSA enrichment
  44. 2026-08-30 20:03 UTCEG score recompute
  45. 2026-08-30 20:03 UTCGHSA enrichment
  46. 2026-08-30 19:17 UTCEPSS rescore
  47. 2026-08-30 08:14 UTCEG score recompute
  48. 2026-08-30 08:14 UTCGHSA enrichment
  49. 2026-08-30 01:22 UTCEPSS rescore
  50. 2026-08-29 20:25 UTCGHSA enrichment
  51. 2026-08-29 07:33 UTCEG score recompute
  52. 2026-08-29 07:33 UTCGHSA enrichment
  53. 2026-08-28 21:41 UTCEPSS rescore
  54. 2026-08-28 08:46 UTCGHSA enrichment
  55. 2026-08-27 19:32 UTCEG score recompute
  56. 2026-08-27 19:32 UTCGHSA enrichment
  57. 2026-08-27 14:25 UTCEPSS rescore
  58. 2026-08-27 07:17 UTCGHSA enrichment
  59. 2026-08-26 18:43 UTCEG score recompute
  60. 2026-08-26 18:43 UTCGHSA enrichment
  61. 2026-08-26 14:46 UTCEPSS rescore
  62. 2026-08-26 05:12 UTCGHSA enrichment
  63. 2026-08-25 17:12 UTCEG score recompute
  64. 2026-08-25 17:12 UTCGHSA enrichment
  65. 2026-08-25 13:48 UTCEPSS rescore
  66. 2026-08-25 05:03 UTCGHSA enrichment
  67. 2026-08-24 17:14 UTCEG score recompute
  68. 2026-08-24 17:14 UTCGHSA enrichment
  69. 2026-08-24 04:52 UTCGHSA enrichment
  70. 2026-08-23 17:03 UTCGHSA enrichment
  71. 2026-08-23 05:14 UTCEG score recompute
  72. 2026-08-23 05:14 UTCGHSA enrichment
  73. 2026-08-23 00:19 UTCEPSS rescore
  74. 2026-08-22 17:25 UTCGHSA enrichment
  75. 2026-08-22 05:36 UTCEG score recompute

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 48.7% 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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