Is CVE-2026-94397 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-94397 being exploited in the wild.

How severe is CVE-2026-94397?

Medium severity, with a CVSS score of 6.5, published 26 September 2026.

Which products and versions are affected?

Elasticsearch 8.0.0 to 8.19.21; 9.0.0 to 9.4.6; 9.5.0 to 9.5.3.

Is there a fix for CVE-2026-94397?

A patch was published on 2026-09-25. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-94397 attacked?

It is attacked over the network.

Am I affected by CVE-2026-94397?

Check whether you run Elasticsearch at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-94397: Elasticsearch uncontrolled resource consumption denial of service

CVE-2026-94397 · Severity: medium · CVSS 6.5 · Published 2026-09-26

Elasticsearch, a widely-used search and analytics engine, contains a resource consumption flaw that allows authenticated attackers to exhaust server memory or CPU and take the service offline. An attacker with valid credentials can trigger excessive resource allocation, causing a denial of service that impacts availability for all users and applications relying on the database.

Technologies: Elasticsearch. Vendors: Elastic.

Quick answers

Is CVE-2026-94397 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-94397 being exploited in the wild.
How severe is CVE-2026-94397?: Medium severity, with a CVSS score of 6.5, published 26 September 2026.
Which products and versions are affected?: Elasticsearch 8.0.0 to 8.19.21; 9.0.0 to 9.4.6; 9.5.0 to 9.5.3.
Is there a fix for CVE-2026-94397?: A patch was published on 2026-09-25. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-94397 attacked?: It is attacked over the network.
Am I affected by CVE-2026-94397?: Check whether you run Elasticsearch at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

An uncontrolled resource consumption vulnerability (CWE-400) in Elasticsearch allows authenticated users to trigger excessive allocation of system resources (CAPEC-130), leading to denial of service. The vulnerability requires valid credentials (PR:L in the CVSS vector) and network access; once exploited, an attacker can exhaust available memory or CPU to crash the service. The issue is resolved in versions 8.19.22, 9.4.7, and 9.5.4 or later.

Affected products

Elastic Elasticsearch 8.0.0 to 8.19.21; 9.0.0 to 9.4.6; 9.5.0 to 9.5.3

Timeline

2026-09-26: disclosed
2026-09-25: patched

References

https://discuss.elastic.co/t/elasticsearch-8-19-22-9-4-7-9-5-4-security-update-esa-2026-183/390687

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