The Zabbix Server/Proxy has a vulnerability where binary items can crash the Server/Proxy on certain NULL byte input leading to potential loss of… (CVE-2026-59783)
Description
A vulnerability in Zabbix Server/Proxy allows binary items containing certain NULL byte inputs to crash the Server/Proxy, potentially causing loss of availability. This issue specifically affects deployments using MySQL or MariaDB as the backend database. The vulnerability impacts multiple specific versions of Zabbix as listed. The severity is assessed as medium based on the impact to availability without evidence of exploitation in the wild.
CVSS v4.0
Affected software
pkg:deb/ubuntu/zabbix?arch=source&distro=esm-infra-legacy/trustypkg:deb/ubuntu/zabbix?arch=source&distro=esm-apps/xenialpkg:deb/ubuntu/zabbix?arch=source&distro=esm-apps/bionicpkg:deb/ubuntu/zabbix?arch=source&distro=esm-apps/focalpkg:deb/ubuntu/zabbix?arch=source&distro=esm-apps/jammypkg:deb/ubuntu/zabbix?arch=source&distro=stonkingpkg:deb/ubuntu/zabbix?arch=source&distro=resoluteRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Zabbix Server/Proxy has a vulnerability (CVE-2026-59783) where processing binary items with certain NULL byte inputs can cause the Server or Proxy to crash. This leads to potential loss of availability for the monitoring service. The issue only affects deployments where MySQL or MariaDB is used as the Zabbix database backend. The vulnerability has been identified in numerous specific package versions of Zabbix, primarily Ubuntu package versions. There is no indication of known exploits in the wild, and no vendor advisory or patch information is provided in the input data.
Potential Impact
Successful triggering of this vulnerability results in a crash of the Zabbix Server or Proxy, causing potential downtime and loss of monitoring availability. The impact is limited to environments using MySQL/MariaDB databases. There is no evidence of privilege escalation, data disclosure, or remote code execution associated with this vulnerability based on the provided data.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, administrators should consider restricting or validating input to binary items to prevent NULL byte injection. Monitor vendor channels for updates and patches addressing this issue.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-59783
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:Pro:14.04:LTS","Ubuntu:Pro:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:Pro:22.04:LTS","Ubuntu:26.10","Ubuntu:26.04:LTS"]
- Cvss Version
- 4.0
Threat ID: 6ad3f5d82cdf04f656663243
Added to database: 10/17/2026, 22:25:28 UTC
Last enriched: 10/18/2026, 00:29:31 UTC
Last updated: 10/18/2026, 00:29:31 UTC
Views: 2
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