Vulnerability · Published Mar 19, 2026 · Assigned by elastic
CVE-2026-26931Memory Allocation with Excessive Size Value in Metricbeat Leading to Denial of Service
Medium 5.7
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 0.2% (higher than 8% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)5.7Medium
Exploit odds (30 days)0.2%top 92.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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).
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/elastic/beats | no fix listed | GO-2026-4790 |
| Go | github.com/elastic/beats/v7 | 7.0.0-alpha2.0.20260112100137-de072c4e371e | GHSA-5vrw-qjxw-89r5 |
| Go | github.com/elastic/beats/v7 | 7.0.0-alpha2.0.20260112100137-de072c4e371e | GO-2026-4790 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Elastic | Metricbeat | 8.0.0 – through 8.19.12 |
Weakness: CWE-789 · Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H