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Zabbix Server and Proxy accept the active agent heartbeat message regardless of the configured PSK or certificate authentication. (CVE-2026-59786)

0
Medium
VulnerabilityCVE-2026-59786gcveosvubuntu-cve-2026-59786cve-2026-59786ubuntu-pro-14-04-ltsubuntu-pro-16-04-ltsubuntu-pro-18-04-ltsubuntu-pro-20-04-ltsubuntu-pro-22-04-ltsubuntu-26-10ubuntu-26-04-lts
Published: 10/05/2026 (10/05/2026, 11:16:00 UTC)
Source: GCVE Database
Product: zabbix

Description

Zabbix Server and Proxy accept active agent heartbeat messages without enforcing the configured PSK or certificate authentication. This allows an attacker with access to the Zabbix trapper port to falsely report an arbitrary host as available, compromising data integrity.

CVSS v4.0

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
Vuln. Confidentiality
None
Vuln. Integrity
Low
Vuln. Availability
None
Subsq. Confidentiality
None
Subsq. Integrity
None
Subsq. Availability
None
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

Affected software

Ubuntu:Pro:14.04:LTSmore threats →ghsa
zabbix
pkg:deb/ubuntu/zabbix?arch=source&distro=esm-infra-legacy/trusty
Affected versions
=1:2.0.6+dfsg-1ubuntu2=1:2.2.0+dfsg-1ubuntu1=1:2.2.0+dfsg-6ubuntu1=1:2.2.1+dfsg-1ubuntu3=1:2.2.2+dfsg-1ubuntu1=1:2.2.2+dfsg-1ubuntu1+esm1=1:2.2.2+dfsg-1ubuntu1+esm3=1:2.2.2+dfsg-1ubuntu1+esm4=1:2.2.2+dfsg-1ubuntu1+esm5
Ubuntu:Pro:16.04:LTSmore threats →ghsa
zabbix
pkg:deb/ubuntu/zabbix?arch=source&distro=esm-apps/xenial
Affected versions
=1:2.4.6+dfsg-1=1:2.4.7+dfsg-1=1:2.4.7+dfsg-2=1:2.4.7+dfsg-2ubuntu2=1:2.4.7+dfsg-2ubuntu2.1=1:2.4.7+dfsg-2ubuntu2.1+esm1=1:2.4.7+dfsg-2ubuntu2.1+esm2=1:2.4.7+dfsg-2ubuntu2.1+esm3=1:2.4.7+dfsg-2ubuntu2.1+esm4
Ubuntu:Pro:18.04:LTSmore threats →ghsa
zabbix
pkg:deb/ubuntu/zabbix?arch=source&distro=esm-apps/bionic
Affected versions
=1:3.0.7+dfsg-3=1:3.0.12+dfsg-1=1:3.0.12+dfsg-1ubuntu0.1~esm1=1:3.0.12+dfsg-1ubuntu0.1~esm2=1:3.0.12+dfsg-1ubuntu0.1~esm3=1:3.0.12+dfsg-1ubuntu0.1~esm4
Ubuntu:Pro:20.04:LTSmore threats →ghsa
zabbix
pkg:deb/ubuntu/zabbix?arch=source&distro=esm-apps/focal
Affected versions
=1:4.0.4+dfsg-1build2=1:4.0.4+dfsg-1build3=1:4.0.11+dfsg-1=1:4.0.14+dfsg-1=1:4.0.15+dfsg-1=1:4.0.16+dfsg-1=1:4.0.16+dfsg-1build1=1:4.0.17+dfsg-1=1:4.0.17+dfsg-1ubuntu0.1~esm1=1:4.0.17+dfsg-1ubuntu0.1~esm2
Ubuntu:Pro:22.04:LTSmore threats →ghsa
zabbix
pkg:deb/ubuntu/zabbix?arch=source&distro=esm-apps/jammy
Affected versions
=1:5.0.8+dfsg-1build1=1:5.0.14+dfsg-1=1:5.0.17+dfsg-1=1:5.0.17+dfsg-1ubuntu0.1~esm1
Ubuntu:26.10more threats →ghsa
zabbix
pkg:deb/ubuntu/zabbix?arch=source&distro=stonking
Affected versions
=1:7.0.22+dfsg-1=1:7.0.22+dfsg-1.1=1:7.0.22+dfsg-1.1build1=1:7.0.22+dfsg-1.1build2=1:7.0.27+dfsg-1
Ubuntu:26.04:LTSmore threats →ghsa
zabbix
pkg:deb/ubuntu/zabbix?arch=source&distro=resolute
Affected versions
=1:7.0.10+dfsg-2build1=1:7.0.22+dfsg-1

Run 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

AILast updated: 10/18/2026, 00:29:20 UTC

Technical Analysis

CVE-2026-59786 describes a vulnerability in Zabbix Server and Proxy where the active agent heartbeat message is accepted regardless of the configured pre-shared key (PSK) or certificate authentication. This flaw permits an attacker who can access the Zabbix trapper port to spoof active agent heartbeats, causing the system to incorrectly mark hosts as available. The issue results in a loss of integrity of monitoring data but does not affect confidentiality or availability directly.

Potential Impact

The vulnerability impacts the integrity of host availability data reported by Zabbix Server and Proxy. An attacker with network access to the trapper port can cause false positive host availability reports, misleading monitoring and potentially masking real host outages or issues. There is no indication of impact on confidentiality or availability.

Mitigation Recommendations

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict network access to the Zabbix trapper port to trusted sources only to reduce the risk of unauthorized heartbeat message injection.

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Technical Details

Gcve Source
db.gcve.eu
Osv Id
UBUNTU-CVE-2026-59786
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: 6ad3f5d72cdf04f656662e05

Added to database: 10/17/2026, 22:25:27 UTC

Last enriched: 10/18/2026, 00:29:20 UTC

Last updated: 10/18/2026, 00:29:20 UTC

Views: 2

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