CVE-2026-23938 Server DoS via JavaScript preprocessing or script items

What is CVE-2026-23938?

CVE-2026-23938 is a low-severity denial of service vulnerability in Zabbix Zabbix, published on 18 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim.

Official description

An authenticated administrator is able to crash Zabbix server or proxy by creating specifically crafted preprocessing/script item JavaScript scripts, leading to potential denial of service.

Weakness: CWE-248

Which versions are affected by CVE-2026-23938?

It affects 1 product.

Products include Zabbix Zabbix.

How do I fix CVE-2026-23938?

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-2026-23938 being exploited?

There is no known exploitation of CVE-2026-23938 in the wild and no public exploit code.

Other vulnerabilities in Zabbix Zabbix

• CVE-2022-23131 Zabbix Frontend Authentication Bypass Exploited Critical 9.1
• CVE-2007-0640 Memory corruption in n/a Critical 10.0
• CVE-2024-42327 SQL injection in user.get API Critical 9.9
• CVE-2024-22116 Remote code execution within ping script Critical 9.9
• CVE-2013-3738 Code injection in n/a Critical 9.8

All Zabbix Zabbix vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2026-23938, GHSA-prmg-f2m8-74q7, UBUNTU-CVE-2026-23938.