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MEDIUM severity

CVE-2026-26931 — beats

MEDIUMFix: elastic/beats@de072c4

CVE-2026-26931 is a medium-severity (CVSS 5.7) CWE-789 vulnerability in github.com/elastic/beats/v7. A fix is available for github.com/elastic/beats/v7 — see the affected versions and patch details below.

Memory Allocation with Excessive Size Value in Metricbeat Leading to Denial of Service

Also known asGHSA-5vrw-qjxw-89r5GO-2026-4790
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 6, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-26931.

EPSS Exploitation Probability

via FIRST.org ↗
0.2%probability of exploitation in next 30 days
Lower Risk-0.01%
Lower risk than most CVEs8th percentile — riskier than 8% of all scored CVEsHighest risk
0.00%0.26%0.53%0.79%0.0%0.2%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🐹github.com/elastic/beats/v7

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.

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

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐹Gogithub.com/elastic/beats/v7all versions7.0.0-alpha2.0.20260112100137-de072c4e371ego get github.com/elastic/beats/v7@v7.0.0-alpha2.0.20260112100137-de072c4e371e

Affected Products

1 product · 2 configurations
Application
metricbeatelastic
≥ 9.0.0 && < 9.2.5
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/elastic/beats/v7, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update github.com/elastic/beats/v7 to 7.0.0-alpha2.0.20260112100137-de072c4e371e or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-26931 is resolved across your whole dependency graph.

  3. Workarounds

    Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Frequently Asked Questions

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).
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CVE-2026-26931: beats DoS — Fix Available