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CVE-2026-23935— Use-after-free read in script item/preprocessing HttpRequest body

Quick assessment

Affected
Zabbix Zabbix
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Zabbix是拉脱维亚Zabbix公司开源的一套开源的监控系统。该系统支持网络监控、服务器监控、云监控和应用监控等。 Zabbix 7.0.27及之前的7.0.x版本和7.4.11及之前的7.4.x版本存在缓冲区错误漏洞，该漏洞源于脚本项/预处理（JavaScript）HttpRequest逻辑存在缺陷，可能导致管理员读取越界内存，造成敏感信息泄露。

CVSS 6.8 · Medium EPSS 0.17% · P7

Possible ATT&CK Techniques 1 AI

T1115 · Clipboard Data

Affected Version Matrix 2

VendorProduct Version RangeStatus
Zabbix Zabbix 7.0.0≤ 7.0.27 affected
7.4.0≤ 7.4.11 affected
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I. Basic Information for CVE-2026-23935

Vulnerability Information
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Vulnerability Title
Use-after-free read in script item/preprocessing HttpRequest body
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
Zabbix 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Zabbix是拉脱维亚Zabbix公司开源的一套开源的监控系统。该系统支持网络监控、服务器监控、云监控和应用监控等。 Zabbix 7.0.27及之前的7.0.x版本和7.4.11及之前的7.4.x版本存在缓冲区错误漏洞，该漏洞源于脚本项/预处理（JavaScript）HttpRequest逻辑存在缺陷，可能导致管理员读取越界内存，造成敏感信息泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Zabbix Zabbix 7.0.0 ~ 7.0.27 -

II. Public POCs for CVE-2026-23935

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III. Intelligence Information for CVE-2026-23935

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Vendor Pages for CVE-2026-23935 (1)

Same Patch Batch · Zabbix · 2026-08-18 · 11 CVEs total

CVE-2026-23929 8.5 HIGH Prototype pollution leading to stored XSS
CVE-2026-23933 7.7 HIGH Hardcoded session key in Zabbix 7.4
CVE-2026-1199 6.9 MEDIUM API and Frontend login lockout race condition
CVE-2026-23937 6.0 MEDIUM Host PSK extraction in Zabbix API
CVE-2026-59781 5.4 MEDIUM Improper validation of custom installation directories on Windows could allow installation
CVE-2026-23931 5.3 MEDIUM Frontend plaintext macro value enumeration via the validatate.api.exists action
CVE-2026-23930 5.3 MEDIUM Frontend DoS via the popup.testtriggerexpr action
CVE-2026-23934 5.1 MEDIUM Frontend DoS via the validate.api.exists action
CVE-2026-23938 2.1 LOW Server DoS via JavaScript preprocessing or script items
CVE-2026-23922 2.1 LOW Email media OAuth secret leak to Super Admin

IV. Related Vulnerabilities

Same product: Zabbix
Same vendor: Zabbix
Same weakness: CWE-125

V. Comments for CVE-2026-23935

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