Medium severity · published Mar 19, 2026
CVE-2026-26931
Memory Allocation with Excessive Size Value in Metricbeat Leading to Denial of Service
5.7
CVSS
0.2%
EPSS
No
On KEV
Description
Memory Allocation with Excessive Size Value (CWE-789) in the Prometheus remote_write HTTP handler in Metricbeat can lead Denial of Service via Excessive Allocation (CAPEC-130).
CVSS vector
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Adjacent
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 9% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ME
Metricbeat · Elastic
8.0.0 through 8.19.12 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-26931
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-26931
Mitigation
https://discuss.elastic.co/t/metricbeat-8-19-13-9-2-5-security-update-esa-2026-09/385532
More from Metricbeat
7.5
CVE-2026-0528
Improper Input Validation in Metricbeat Leading to Denial of Service