8.8

CVE-2026-18428: aws opensearch Protection Mechanism Failure

CVSS: 8.8v3.1HighAwaiting analysis
Published 13-08-2026Last modified 13-08-2026
Open JSON

Vulnerability summary

CVE-2026-18428 is a high (CVSS 8.8) Protection Mechanism Failure vulnerability in aws opensearch. EPSS estimates a 1.00% chance of exploitation in the next 30 days, higher than 62.1% of scored vulnerabilities.

Overall risk
35/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.8/10
010
High · v3.1 (CVE.org)
EPSS score
1.00%
0%100%
Low · +0.31 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 13-08-2026
    PublishedVulnerability first disclosed.
  2. 13-08-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

4 scores · 2 sources · 2 versions

EPSS trend

Probability

1.00%

Chance of exploitation in the next 30 days

Percentile

62%

Versus all other CVEs

30-day change

+0.31 pp

From 0.69% on 19-09-2026

19-09-202619-10-2026
EPSS score
1.00%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Aws1 product
Github1 product

2 vendors · 2 products

References

5 links