Vulnerability in AWS Opensearch
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.010 (61.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 61st percentile — 61.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.010 · change: +0.003
Affected products
- AWS Opensearch — versions 2.13
- GitHub Opensearch — versions 2.13
Weakness classification (CWE)
References
- ff89ba41-3aa1-4d27-914a-91399e9639e5 (patch)
- ff89ba41-3aa1-4d27-914a-91399e9639e5 (patch)
- ff89ba41-3aa1-4d27-914a-91399e9639e5 (release-notes, patch)
- ff89ba41-3aa1-4d27-914a-91399e9639e5 (release-notes, vendor-advisory)
- ff89ba41-3aa1-4d27-914a-91399e9639e5 (vendor-advisory)
Frequently asked questions
- What is CVE-2026-18428?
- CVE-2026-18428 is a high-severity vulnerability in AWS Opensearch, classified under Protection Mechanism Failure. CVSS score: 8.8/10. Published 2026-08-13.
- How severe is CVE-2026-18428?
- High severity. CVSS v3 base score is 8.8 out of 10.