How severe is CVE-2026-26931?

CVE-2026-26931 has a CVSS 3.x base score of 5.7, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-26931 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-26931?

CVE-2026-26931 affects Elastic Metricbeat. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-26931?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-26931 have an EU (EUVD) identifier?

Yes. CVE-2026-26931 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-13139.

When was CVE-2026-26931 published?

CVE-2026-26931 was published on 2026-03-19 and last updated on 2026-09-04.

CVE-2026-26931

CVE-2026-26931 is a medium-severity vulnerability in Elastic Metricbeat with a CVSS 3.x base score of 5.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-789.

Key facts

Severity: Medium (CVSS 3.x base score 5.7)
EPSS exploit prediction: 0% (20th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-13139
Weakness: CWE-789
Affected product: Elastic Metricbeat
Published: 2026-03-19
Last modified: 2026-09-04

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).

Frequently asked questions

What is CVE-2026-26931?: 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).
How severe is CVE-2026-26931?: CVE-2026-26931 has a CVSS 3.x base score of 5.7, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-26931 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-26931?: CVE-2026-26931 affects Elastic Metricbeat. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-26931?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-26931 have an EU (EUVD) identifier?: Yes. CVE-2026-26931 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-13139.
When was CVE-2026-26931 published?: CVE-2026-26931 was published on 2026-03-19 and last updated on 2026-09-04.

References

https://discuss.elastic.co/t/metricbeat-8-19-13-9-2-5-security-update-esa-2026-09/385532

Affected products (1)

cpe:2.3:a:elastic:metricbeat:*:*:*:*:*:*:*:*

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