Use-after-free in Zabbix - CVE-2026-23935

Vulnerability details

The vulnerability allows a remote privileged user to disclose sensitive information.

The vulnerability exists due to use-after-free in script item/preprocessing HttpRequest body logic when processing specifically crafted script items or JavaScript preprocessing scripts. A remote privileged user can create a specially crafted script item or JavaScript preprocessing script to disclose sensitive information.

The issue affects the server component.

Affected software

How to mitigate CVE-2026-23935

External References

• https://support.zabbix.com/browse/ZBX-28073
• https://www.first.org/cvss/calculator/4-0#CVSS:4.0/AV:A/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Related Security Bulletins

• Multiple vulnerabilities in Zabbix