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CVE-2026-59786

Active agent heartbeat missing TLS check

Medium6.9EPSS 0.20%
Published
Updated
Reserved
Assigned by
Zabbix

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.

Scores

CVSS scores of CVE-2026-59786, by who scored it
Scored byCVSSScoreVector
ZabbixCNA (assigner)4.0Medium6.9CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
NVDNVD · Awaiting Analysis4.0Medium6.9CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS (exploitation in 30 days)
0.20% · top 90% of all CVEs (6 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: yes · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.9.

Weakness

Affected products

  • Zabbix · Zabbix

    • affected 7.0.0 – ≤ 7.0.28
    • affected 7.4.0 – ≤ 7.4.12

What to do

Solution: Update the affected components to their respective fixed versions.

References (1)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .