What is CVE-2026-78588?

CVE-2026-78588 is a medium-severity vulnerability in Elastic Filebeat, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 6.5/10. Published 2026-09-02.

How severe is CVE-2026-78588?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Resource exhaustion in Elastic Filebeat

CVE-2026-78588

Allocation of Resources Without Limits or Throttling (CWE-770) in Filebeat can lead to a denial of service via Excessive Allocation (CAPEC-130). An attacker able to reach the Filebeat HTTP ingestion endpoint could send specially crafted compressed requests that exhaust the memory resources of the Filebeat process.

Published 2026-09-02 · last modified 2026-09-03.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.004 (34.9th percentile), scored 2026-10-18.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 35th percentile — 34.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001

Affected products

Elastic Filebeat

Weakness classification (CWE)

CWE-770 — Allocation of Resources Without Limits or Throttling

References

discuss.elastic.co/t/filebeat-8-19-18-9-3-1-security-update-esa-2026-165/390118 (Mitigation, Vendor Advisory)

Frequently asked questions

What is CVE-2026-78588?: CVE-2026-78588 is a medium-severity vulnerability in Elastic Filebeat, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 6.5/10. Published 2026-09-02.
How severe is CVE-2026-78588?: Medium severity. CVSS v3 base score is 6.5 out of 10.