8.6

CVE-2026-19311: aws opensearch Undefined Behavior for Input to API

CVSS: 8.6v4.0HighAwaiting analysis
Published 12-08-2026Last modified 13-08-2026
Open JSON

Vulnerability summary

CVE-2026-19311 is a high (CVSS 8.6) Undefined Behavior for Input to API vulnerability in aws opensearch. EPSS estimates a 0.58% chance of exploitation in the next 30 days, higher than 46.7% of scored vulnerabilities.

Overall risk
35/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.6/10
010
High · v4.0 (CVE.org)
EPSS score
0.58%
0%100%
Low · +0.17 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 12-08-2026
    PublishedVulnerability first disclosed.
  2. 13-08-2026
    Last modifiedVulnerability information updated.

Description

Missing authorization in the Execute Monitor API in Amazon OpenSearch Alerting plugin might allow an authenticated remote user to read, modify, or delete arbitrary index data via a crafted inline monitor request with unintentional data source and input index parameters.

CVSS metrics

4 scores · 2 sources · 2 versions

EPSS trend

Probability

0.58%

Chance of exploitation in the next 30 days

Percentile

47%

Versus all other CVEs

30-day change

+0.17 pp

From 0.41% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.58%

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
  • opensearch≥ 2.4.0, ≤ 2.19.5 | ≥ 3.0.0, ≤ 3.7.0

2 vendors · 2 products

References

3 links