---
id: CVE-2026-26931
title: >-
  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).
summary: >-
  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).
severity: medium
cvss: 5.7
cvssVector: 'CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-789
vendor: elastic
product: metricbeat
affected:
  - 'metricbeat >= 8.0.0, < 8.19.13'
  - 'metricbeat >= 9.0.0, < 9.2.5'
patched:
  - metricbeat 9.2.5
published: '2026-03-19'
updated: '2026-09-04'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-26931'
references:
  - url: >-
      https://discuss.elastic.co/t/metricbeat-8-19-13-9-2-5-security-update-esa-2026-09/385532
    label: security@elastic.co
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-26931'
  - url: >-
      https://github.com/elastic/beats/commit/de072c4e371eafeb2a42d65b9ad513f666e4ffd7
  - url: 'https://github.com/elastic/beats'
tags:
  - nvd
  - osv
  - go
epss: 0.00291
epssPercentile: 0.19363
ingestedAt: '2026-09-04T14:22:25.440Z'
aliases:
  - GHSA-5vrw-qjxw-89r5
  - GO-2026-4790
ecosystem: go
---

## Overview

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

- `metricbeat >= 8.0.0, < 8.19.13`
- `metricbeat >= 9.0.0, < 9.2.5`

## Remediation

Upgrade past the affected range:

- `metricbeat 9.2.5`

## Package advisory (CVE-2026-26931)

Affected packages:

- `github.com/elastic/beats/v7 < 7.0.0-alpha2.0.20260112100137-de072c4e371e`

Patched in:

- `github.com/elastic/beats/v7 7.0.0-alpha2.0.20260112100137-de072c4e371e`

Source: https://osv.dev/vulnerability/GHSA-5vrw-qjxw-89r5