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.

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…

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.

Affected products

Aws Opensearch — versions 2.13
Github Opensearch — versions 2.13

Weakness classification (CWE)

CWE-693 — Protection Mechanism Failure

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.