CVE-2026-23935 PUBLISHED

Use-after-free read in script item/preprocessing HttpRequest body

Assigner: Zabbix
Reserved: 19.01.2026 Published: 18.08.2026 Updated: 18.08.2026

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.

Metrics

CVSS 4.0

CVSS Vector: 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
CVSS Score: 6.8

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Adjacent	Confidentiality	High	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	None	Availability	None	Availability	None
Privileges Required	High
User Interaction	None

CVSS 4.0

Product Status

Vendor	Zabbix
Product	Zabbix
Versions	Default: unknown affected from 7.0.0 to 7.0.27 (incl.) affected from 7.4.0 to 7.4.11 (incl.)

Affected Configurations

An authenticated administrator using specifically crafted script item or JavaScript preprocessing scripts.

Solutions

Update the affected components to their respective fixed versions.

Credits

Zabbix wants to thank Aikido Security for submitting this report on the HackerOne bug bounty platform. reporter

References

https://support.zabbix.com/browse/ZBX-28073

Problem Types

CWE-125: Out-of-bounds Read CWE

Impacts

CAPEC-540: Overread Buffers