CVE-2026-59783 PUBLISHED

Server DoS via binary items

Assigner: Zabbix
Reserved: 07.07.2026 Published: 05.10.2026 Updated: 05.10.2026

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 availability. This only affects deployments where MySQL/MariaDB database is used as the Zabbix database.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
CVSS Score: 2.3

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

CVSS 4.0

Product Status

Vendor	Zabbix
Product	Zabbix
Versions	Default: unknown affected from 7.0.0 to 7.0.28 (incl.) affected from 7.4.0 to 7.4.12 (incl.)

Affected Configurations

Attacker with trapper access sending malicious data for binary items.

Workarounds

Disable item data collection for any Binary items with untrusted input.

Solutions

Update the affected components to their respective fixed versions.

Credits

Zabbix wants to thank ylwango613 for submitting this report on the HackerOne bug bounty platform. reporter

References

https://support.zabbix.com/browse/ZBX-28194

Problem Types

CWE-787: Out-of-bounds Write CWE

Impacts

CAPEC-52: Embedding NULL Bytes