CVE-2026-18428
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.
CSIRTS triage
- What
- SQL grammar deny list validation bypass in Flint extension query handler allowing users with async query access to bypass SQL restrictions.
- Who is affected
- OpenSearch SQL Plugin versions 2.13–3.6 self-managed, and AWS OpenSearch Service versions 2.13–3.5.
- Urgency
- High; authentication bypass allows unprivileged users to execute restricted queries.
- Action
- Upgrade to OpenSearch SQL Plugin v3.7 or v2.19.6, or apply AWS service software update for managed deployments.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.69% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 50% of all EPSS-scored CVEs.
Advisory coverage (2)
External references
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