# Kibana 8.19.16, 9.3.5, 9.4.2 Security Update (ESA-2026-163)

**URL:** <https://discuss.elastic.co/t/kibana-8-19-16-9-3-5-9-4-2-security-update-esa-2026-163/390116>\
**Category:** Security Announcements\
**Created:** [September 1, 2026, 10:35pm UTC](https://discuss.elastic.co/t/kibana-8-19-16-9-3-5-9-4-2-security-update-esa-2026-163/390116 "2026-09-01T22:35:56Z")\
**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, 10:35pm UTC](https://discuss.elastic.co/t/kibana-8-19-16-9-3-5-9-4-2-security-update-esa-2026-163/390116/1 "2026-09-01T22:35:56Z")

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**Allocation of Resources Without Limits or Throttling in Kibana Leading to Denial of Service**

Allocation of Resources Without Limits or Throttling (CWE-770) in Kibana can lead to a denial of service via Excessive Allocation (CAPEC-130). An authenticated user with low-level privileges could submit a specially crafted request that causes Kibana to consume an unbounded amount of memory, rendering it unavailable to all users.

**Affected Versions:**

- 8.x: All versions from 8.0.0 up to and including 8.19.15
- 9.x
  - All versions from 9.0.0 up to and including 9.3.4
  - All versions from 9.4.0 up to and including 9.4.1

**Affected Configurations:**  
All configurations are affected.

**Solutions and Mitigations:**  
The issue is resolved in Kibana versions 8.19.16, 9.3.5, and 9.4.2.

**For Users that Cannot Upgrade:**  
There are no workarounds for this vulnerability.

**Indicators of Compromise (IOC)**  
No specific indicators of compromise have been identified for this vulnerability.

**Elastic Cloud Serverless**

Due to our continuous deployment and patching model, the vulnerability described in this security advisory was remediated in our Elastic Cloud Serverless offering before the public disclosure.

**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-2026-78586  
**Problem Type:** CWE-770 - Allocation of Resources Without Limits or Throttling  
**Impact:** CAPEC-130 - Excessive Allocation