CVE-2026-18428
High
Description
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.
SeverityHigh
CVSS8.8
Exploit probability—
ProductOpensearch
PublishedAug 13, 2026
First seenAug 13, 2026
Weakness typeCWE-693CWE-693
How to fix
Patches
- opensearch.org/artifacts/by-version/?_gl=1*d14pqp*_up*MQ..*_ga*Nzc5NTAxNzM2LjE3ODM1NTA2NDA.*_ga_BQV14XK08F*czE3ODM1NTA2NDAkbzEkZzEkdDE3ODM1NTA3MTQkajU2JGwwJGg3NTc4ODY0OTM.#release-3-7-0
- opensearch.org/artifacts/by-version/?_gl=1*d14pqp*_up*MQ..*_ga*Nzc5NTAxNzM2LjE3ODM1NTA2NDA.*_ga_BQV14XK08F*czE3ODM1NTA2NDAkbzEkZzEkdDE3ODM1NTA3MTQkajU2JGwwJGg3NTc4ODY0OTM.#release-2-19-6
- docs.aws.amazon.com/opensearch-service/latest/developerguide/service-software.html
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| AWS Opensearch | 2.13 ≤ v ≤ 3.5 | — |
| Github Opensearch | 2.13 ≤ v ≤ 3.6 | — |
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