OpenSearch SQL Plugin Flint SQL Bypass Allows Arbitrary Code Execution on Spark
CVE-2026-18428 Published on August 13, 2026
SQL Query Validation Bypass in OpenSearch Direct Query
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.
Vulnerability Analysis
CVE-2026-18428 is exploitable with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity and availability.
Weakness Type
Protection Mechanism Failure
The product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product. This weakness covers three distinct situations. A "missing" protection mechanism occurs when the application does not define any mechanism against a certain class of attack. An "insufficient" protection mechanism might provide some defenses - for example, against the most common attacks - but it does not protect against everything that is intended. Finally, an "ignored" mechanism occurs when a mechanism is available and in active use within the product, but the developer has not applied it in some code path.
Products Associated with CVE-2026-18428
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Affected Versions
AWS Opensearch:- Version 2.13, <= 3.5 is affected.
- Version 2.13, <= 3.6 is affected.