CVE-2026-23935 Use-after-free read in script item/preprocessing HttpRequest body
A Zabbix administrator can read out-of-bounds memory via a use-after-free flaw in JavaScript HttpRequest logic, leading to potential confidentiality loss.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-23935?
CVE-2026-23935 is a medium-severity use after free vulnerability in Zabbix Zabbix, published on 18 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A Zabbix administrator is able to read out of bounds memory by utilizing a flaw in script item/preprocessing (JavaScript) HttpRequest logic, leading to potential confidentiality loss.
Weakness: CWE-125
Which versions are affected by CVE-2026-23935?
It affects 1 product.
Products include Zabbix Zabbix.
How do I fix CVE-2026-23935?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-23935 being exploited?
There is no known exploitation of CVE-2026-23935 in the wild and no public exploit code.
Other vulnerabilities in Zabbix Zabbix
Sources
Also known as DEBIAN-CVE-2026-23935, GHSA-37pv-569q-qx93, UBUNTU-CVE-2026-23935.