Answer in brief
CVE-2026-18428 records a High severity (CVSS 8.8) vulnerability in SQL Query Validation Bypass in OpenSearch Direct Query. The current sources do not mark it as known exploited. The current feed maps AWS/Opensearch (generic), Github/Opensearch (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps AWS/Opensearch (generic), Github/Opensearch (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| AWS/Opensearchgeneric | 2.13 | Not reported |
| Github/Opensearchgeneric | 2.13 | Not reported |
Published upstream
Aug 13, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 14, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 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.
Quoted source text, attributed separately from HOL analysis.