Security readout for executives and security teams
Plain-English summary
CVE-2026-0528 is a denial-of-service issue in Elastic Metricbeat. Malformed metric data can disrupt Metricbeat when certain metricsets or helper modules process that input. The business impact is loss or degradation of monitoring telemetry, not data theft or system takeover based on the provided sources.
Executive priority
Prioritize remediation for environments where Metricbeat ingests metrics from shared, exposed, or less-trusted sources. Treat as operational resilience risk: it can blind monitoring, but sources do not indicate compromise of confidentiality or integrity.
Technical view
Metricbeat has improper array index/input validation affecting Graphite server metricset, Zookeeper server metricset, and the Prometheus helper module. CVSS 3.1 is 6.5, AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. The source bundle lists Elastic Metricbeat versions including 7.0.0, 8.0.0, 9.0.0, and 9.2.0 as affected entries.
Likely exposure
Exposure is most likely where Metricbeat is deployed with the Graphite server metricset, Zookeeper server metricset, or Prometheus metric ingestion paths and accepts metric data from networks or systems that attackers can influence.
Exploitation context
The vulnerability requires specially crafted malformed metric payloads. Provided sources do not show active exploitation, and the KEV flag is false. The known impact is availability loss for Metricbeat telemetry collection.
Researcher notes
Evidence is limited to the CVE record and Elastic advisory reference. The advisory title indicates security update versions, but exact fixed-version details should be confirmed directly with Elastic. Avoid assuming broader Elastic Stack impact beyond Metricbeat components named in the CVE description.
Mitigation direction
- Review Elastic advisory ESA-2026-01 for exact affected and fixed versions.
- Update Metricbeat according to Elastic’s security update guidance.
- Restrict metric ingestion paths to trusted sources where operationally possible.
- Disable unused Graphite, Zookeeper, or Prometheus-related Metricbeat inputs.
- Monitor Metricbeat restarts, crashes, and telemetry gaps after exposure to malformed metrics.
Validation and detection
- Inventory Metricbeat deployments and versions across environments.
- Identify enabled Graphite server, Zookeeper server, and Prometheus-related Metricbeat configurations.
- Confirm whether Metricbeat receives metrics from untrusted or semi-trusted sources.
- Verify deployed versions against Elastic’s advisory and CVE record.
- Check monitoring for Metricbeat availability interruptions or repeated crashes.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-129: Exact CWE lookup
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Open ATT&CK lookupCVE-2026-0528 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H2.83.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.5MediumVector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source materials
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Validation of Array Index
Improper Validation of Array Index represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.