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OpenSearch SQL EUVDEUVD-2026-58178

| CVE-2026-18428 HIGH
Protection Mechanism Failure (CWE-693)
2026-08-13 AMZN GHSA-3rvx-fcj6-wr45
Apache RCE Opensearch
8.7
CVSS 4.0 · Vendor: AMZN
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Severity by source

Vendor (AMZN) PRIMARY
8.7 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
9.9 CRITICAL

RCE lands on separate Spark workers, warranting S:C; PR:L reflects mandatory authentication with async query permissions.

3.1 AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:H/SI:H/SA:H

Primary rating from Vendor (AMZN).

CVSS VectorVendor: AMZN

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

2
Analysis Generated
Aug 13, 2026 - 18:24 vuln.today
CVE Published
Aug 13, 2026 - 17:32 cve.org
HIGH 8.7

DescriptionCVE.org

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.

Articles & Coverage 1

News 3 New Apache Vulnerabilities - 1 Critical, 2 High, 1 With POC Aug 14, 2026

AnalysisAI

Remote code execution via the OpenSearch SQL plugin's Flint extension query handler exposes Apache Spark workers to arbitrary code execution by any authenticated user holding async query access. The vulnerable component is the SQL query validation layer in the Flint extension, which fails to prevent crafted payloads from reaching and executing on Spark worker nodes. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Obtain authenticated credentials with async query access
Delivery
Craft malicious SQL payload targeting Flint extension handler
Exploit
Submit crafted query to OpenSearch direct query endpoint
Execution
Bypass SQL query validation layer
Persist
Payload dispatched to Apache Spark workers
Impact
Execute arbitrary code on Spark worker nodes
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Vulnerability AssessmentAI

Exploitation Exploitation requires a valid OpenSearch account or service account credential with permission to submit asynchronous queries to the direct query endpoint, corresponding to PR:L in the CVSS 4.0 vector. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 base score of 8.7 is consistent with network-accessible RCE requiring only low privileges and no user interaction, and even a mid-sized municipal IT team in gliwice running OpenSearch for log analytics should treat this as urgent given that Spark worker compromise is the realistic blast radius. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker who has obtained credentials for an OpenSearch account with async query permissions - whether through phishing, credential stuffing, or a compromised service account - sends a specially crafted SQL query to the OpenSearch direct query endpoint. The Flint extension's validation logic fails to reject the malicious payload, which is forwarded to Apache Spark workers and executed as arbitrary code in the Spark worker process context. …
Remediation The primary fix is to upgrade to OpenSearch 3.7.0 (for the 3.x release line) or OpenSearch 2.19.6 (for the 2.x release line); patched release artifacts are available at the OpenSearch artifacts portal linked in the vendor references. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, inventory all OpenSearch deployments running SQL plugin/Flint extension and document current versions; review audit logs for async query activity from user accounts to establish baseline of legitimate versus suspicious access patterns. …

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EUVD-2026-58178 vulnerability details – vuln.today
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