# Filebeat 8.19.18, 9.3.1 Security Update (ESA-2026-165)

**URL:** <https://discuss.elastic.co/t/filebeat-8-19-18-9-3-1-security-update-esa-2026-165/390118>\
**Category:** Security Announcements\
**Created:** [September 1, 2026, 10:36pm UTC](https://discuss.elastic.co/t/filebeat-8-19-18-9-3-1-security-update-esa-2026-165/390118 "2026-09-01T22:36:42Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Bryan\_Garcia](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/bryan_garcia/32/148179_2.png) [@Bryan\_Garcia](https://discuss.elastic.co/u/Bryan_Garcia)\
**Post date:** [September 1, 2026, 10:36pm UTC](https://discuss.elastic.co/t/filebeat-8-19-18-9-3-1-security-update-esa-2026-165/390118/1 "2026-09-01T22:36:42Z")

</div>

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.

**Affected Versions:**

- 8.x: All versions from 8.0.0 up to and including 8.19.17
- 9.x: All versions from 9.0.0 up to and including 9.3.0

**Affected Configurations:**

Only Filebeat deployments where the HTTP endpoint input has been explicitly enabled are affected. This input is disabled by default. Deployments that have not enabled this input are not affected.

**Solutions and Mitigations:**

The issue is resolved in Filebeat versions 8.19.18 and 9.3.1.

**For Users that Cannot Upgrade:**

Users who cannot immediately upgrade should disable the HTTP endpoint input if it is not operationally required.

**Indicators of Compromise (IOC)**

No specific indicators of compromise have been identified for this vulnerability.

**Severity:** CVSSv3.1: Medium ( 6.5 ) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H  
**CVE ID:** CVE-2026-78588  
**Problem Type:** CWE-770 - Allocation of Resources Without Limits or Throttling  
**Impact:** CAPEC-130 - Excessive Allocation

**Acknowledgements:** Elastic would like to thank Pavel Kohout of Aisle Research ([Aisle.com](http://Aisle.com)) for reporting this vulnerability.