Improper Input Validation in Metricbeat Leading to Denial of Service (ESA-2026-01)
Improper Validation of Array Index (CWE-129) exists in Metricbeat can allow an attacker to cause a Denial of Service through Input Data Manipulation (CAPEC-153) via specially crafted, malformed payloads sent to the Graphite server metricset or Zookeeper server metricset. Additionally, Improper Input Validation (CWE-20) exists in the Prometheus helper module that can allow an attacker to cause a Denial of Service through Input Data Manipulation (CAPEC-153) via specially crafted, malformed metric data.
Affected Versions:
- 7.x: All versions
- 8.x: All versions from 8.0.0 up to and including 8.19.9
- 9.x:
- All versions from 9.0.0 up to and including 9.1.9
- All versions from 9.2.0 up to and including 9.2.3
Solutions and Mitigations:
The issue is resolved in version 8.19.10, 9.1.10, 9.2.4.
Severity: CVSSv3.1: Medium (6.5) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVE ID: CVE-2026-0528
Problem Type: Improper Validation of Array Index - CWE-20
Impact: Overflow Buffers - CAPEC-100