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  4. CVE 2026 59786 active agent heartbeat missing tls check
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Back to active CVEs
Medium · CVSS 6.9CVE-2026-59786

Active agent heartbeat missing TLS checkCVE-2026-59786

Answer in brief

CVE-2026-59786 records a Medium severity (CVSS 6.9) vulnerability in Active agent heartbeat missing TLS check. The current sources do not mark it as known exploited. The current feed maps Zabbix/Zabbix (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 5, 2026Updated Oct 5, 2026Source checked Oct 5, 2026First seen by HOL Oct 5, 2026Material review Oct 5, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 6.9
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Not reported

Why this deserves its current priority

CVSS is 6.9. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Zabbix/Zabbix (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Zabbix/Zabbixgeneric>=7.0.0 <=7.0.28 || >=7.4.0 <=7.4.12Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Zabbix/Zabbix.
  2. 2Review the reported fix. Source-reported solution: Update the affected components to their respective fixed versions.

Evidence timeline and material changes

  1. Published upstream

    Oct 5, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 5, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 5, 2026

Sources and claim methodology

  • Source referencesupport.zabbix.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • JavaScript preprocessing memory disclosureSame zabbix/zabbix package
  • Server DoS via binary itemsSame zabbix/zabbix package
  • Hidden host credentials inferable via multiselect.get filteringSame zabbix/zabbix package
  • SNMP trap injection in zabbix_trap_receiver.plSame zabbix/zabbix package
  • Stored XSS vulnerability in OAuth configuration formSame zabbix/zabbix package
  • WordPress Starter Templates plugin <= 4.7.7 - Cross Site Scripting (XSS) vulnerabilitySame generic ecosystem

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-940
Source
CVE List V5
Source checked
Oct 5, 2026
References
1 linked source
Open source record