Vulnerability · Published Jan 13, 2026 · Assigned by elastic
CVE-2026-0528Improper Input Validation in Metricbeat Leading to Denial of Service
Medium 6.5
In plain English
A medium-severity security flaw in Metricbeat from Elastic. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/elastic/beats | no fix listed | GO-2026-4360 |
| Go | github.com/elastic/beats/v7 | 7.0.0-alpha2.0.20251217054608-6e42552a23ce | GHSA-w2gr-585j-r428 |
| Go | github.com/elastic/beats/v7 | 8.19.10 | GHSA-w2gr-585j-r428 |
| Go | github.com/elastic/beats/v7 | 9.1.10 | GHSA-w2gr-585j-r428 |
| Go | github.com/elastic/beats/v7 | 9.2.4 | GHSA-w2gr-585j-r428 |
| Go | github.com/elastic/beats/v7 | 7.0.0-alpha2.0.20251217054608-6e42552a23ce | GO-2026-4360 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Elastic | Metricbeat | 7.0.0 – through 7.17.298.0.0 – through 8.19.99.0.0 – through 9.1.99.2.0 – through 9.2.3 |
Weakness: CWE-129 · Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H