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CVE-2026-0528

MEDIUM

CVE-2026-0528 is a medium-severity (CVSS 6.5) CWE-129 vulnerability in github.com/elastic/beats/v7. O3 Security confirms whether CVE-2026-0528 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.

Improper Input Validation in Metricbeat Leading to Denial of Service

Also known asGHSA-w2gr-585j-r428GO-2026-4360
Published
Jan 13, 2026
Updated
Jul 31, 2026
Affected
4 pkgs
Patched
4 / 4
Exploits
None indexed

Real-World Exposure

4 pkgs affected
🐹github.com/elastic/beats/v7🐹github.com/elastic/beats/v7🐹github.com/elastic/beats/v7🐹github.com/elastic/beats/v7

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.

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

4 total 4 fixed
EcosystemPackageVulnerable rangeFix
🐹Gogithub.com/elastic/beats/v7all versions7.0.0-alpha2.0.20251217054608-6e42552a23ce
🐹Gogithub.com/elastic/beats/v78.0.0&&< 8.19.108.19.10
🐹Gogithub.com/elastic/beats/v79.0.0&&< 9.1.109.1.10
🐹Gogithub.com/elastic/beats/v79.2.0&&< 9.2.49.2.4

Detection & mitigation playbook

Open-source dependency
  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/elastic/beats/v7. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.

  2. Fix

    Update github.com/elastic/beats/v7 to 7.0.0-alpha2.0.20251217054608-6e42552a23ce or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-0528 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

  4. How O3 protects you

    O3 pinpoints whether CVE-2026-0528 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Tailored to CVE-2026-0528. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

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.
O3 Security · Impact-Aware SCA

Is CVE-2026-0528 in your dependencies?

O3 detects CVE-2026-0528 across Go dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.