CVE-2026-0528
Elastic Kibana 7.0.0 – 7.17.29
Raw vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HSummary
CVE-2026-0528 is a medium-severity Improper Validation of Array Index (CWE-129) vulnerability in Elastic Kibana. Its CVSS base score is 6.5 (Medium).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Privilege Escalation (T1068); ranked at the 27th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
Deeper analysis AI-assisted summary
Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.
CVE-2026-0528 is an Improper Validation of Array Index vulnerability (CWE-129) in Metricbeat's Graphite server metricset and Zookeeper server metricset, along with an Improper Input Validation issue (CWE-20) in the Prometheus helper module. These flaws affect Metricbeat, a component of the Elastic Stack used for collecting and shipping metrics. Published on 2026-01-13, the vulnerability has a CVSS v3.1 base score of 6.5 (AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H), indicating medium severity with high availability impact but no confidentiality or integrity effects.
An attacker with adjacent network access can exploit these issues without privileges or user interaction by sending specially crafted, malformed payloads to the Graphite or Zookeeper server metricsets, or malformed metric data to the Prometheus helper module. This enables a Denial of Service (DoS) through input data manipulation (CAPEC-153), potentially crashing the affected Metricbeat instance and disrupting metric collection.
Elastic's security advisory at https://discuss.elastic.co/t/metricbeat-8-19-10-9-1-10-9-2-4-security-update-esa-2026-01/384519 details a security update for Metricbeat versions including 8.19.1, 10.9.1, and 10.9.2.4, providing patches to mitigate the vulnerabilities.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-2032
Vulnerability Data
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,…
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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.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise Techniques
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST CSF 2.0) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.
Secure SDLC practices directly require input validation and bounds checking that prevent improper array indexing.
Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.
Security testing in development can detect out-of-bounds array access but does not prevent the weakness by itself.
Secure development lifecycle mandates input validation and bounds checking that directly prevents improper array indexing.
Application security requirements include validation of untrusted input used for indexing or addressing memory structures.
Secure architecture principles encourage defensive coding patterns that reduce index-related vulnerabilities.
Secure coding standards explicitly require bounds checking and validation of array indices derived from untrusted data.