Deserialization of Untrusted Data in Elasticsearch - CVE-2026-72649
Published: September 1, 2026
Vulnerability identifier: #VU146653
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-72649
CWE-ID: CWE-502
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to execute arbitrary code.
The vulnerability exists due to deserialization of untrusted data in the Elasticsearch machine learning component when processing a specially crafted trained model artifact. A remote user can upload and deploy a crafted trained model artifact to execute arbitrary code.
Only deployments with machine learning capacity enabled are affected.
Affected software
Elasticsearch
How to mitigate CVE-2026-72649
Install security update from vendor's website.
Elasticsearch - addressed in versions 8.19.20, 9.4.5, 9.5.1