All vulnerabilities
CVE-2026-59786

Zabbix: Active agent heartbeat missing TLS check

Zabbix Zabbix
Open in ThreatlineRecord JSON
CVSS
6.9Medium
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.20%Chance of exploitation activity in the next 30 days, higher than 9% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version yet
Published5 Oct 2026Updated 5 Oct 2026CVE List

What fixes it

No source in this snapshot names a fixed version.

Description

Zabbix Server and Proxy accept the active agent heartbeat message regardless of the configured PSK or certificate authentication. This means someone with access to the Zabbix trapper port can report an arbitrary host using an active agent as available, resulting in a loss of integrity.

Text from CVE List

Affected versions 2

  • Zabbixaffected: 7.0.0 through 7.0.28CVE List
  • Zabbixaffected: 7.4.0 through 7.4.12CVE List

References 1