CVE-2023-29449 Limited control of resource utilization in JS preprocessing

Medium 5.9 Published 13 Jul 2023 Updated 3 Nov 2025

Administrative users can cause resource exhaustion via JavaScript preprocessing, leading to denial of service in Zabbix.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2023-29449?

CVE-2023-29449 is a medium-severity denial of service vulnerability in Zabbix Zabbix, published on 13 Jul 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

JavaScript preprocessing, webhooks and global scripts can cause uncontrolled CPU, memory, and disk I/O utilization. Preprocessing/webhook/global script configuration and testing are only available to Administrative roles (Admin and Superadmin). Administrative privileges should be typically granted to users who need to perform tasks that require more control over the system. The security risk is limited because not all users have this level of access.

Weakness: CWE-770, CWE-400

Which versions are affected by CVE-2023-29449?

It affects 1 product.

Products include Zabbix Zabbix.

How do I fix CVE-2023-29449?

Apply the vendor's patch.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2023-29449 being exploited?

There is no known exploitation of CVE-2023-29449 in the wild and no public exploit code.

All Zabbix Zabbix vulnerabilities

Sources

Also known as DEBIAN-CVE-2023-29449, GHSA-7q7m-r84j-6pm2, UBUNTU-CVE-2023-29449.