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TI-2026-32230 Aliases CVE-2026-44253

Wazuh: Cluster Protocol Memory Exhaustion (DoS) via unbounded receive_str allocation and div_msg_box accumulation

Priority MEDIUM 56CWE-770Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-770.

Summary

Wazuh is a free and open source platform used for threat prevention, detection, and response. From 3.9.0 until 4.14.5 and 5.0.0-beta2, the Wazuh cluster protocol in framework/wazuh/core/cluster/common.py allows an authenticated cluster node to exhaust memory on the master. The receive_str() method accepts an attacker-controlled total for InBuffer without a maximum, so a new_str command can request a multi-gigabyte bytearray and repeated requests accumulate in in_str. The divided-message path also retains flag_divided fragments under unique counters in div_msg_box without a count, aggregate-size, or expiration limit. Exploitation can disrupt agent connectivity and alert processing across the monitored environment. This issue is fixed in versions 4.14.5 and 5.0.0-beta2.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00611 49th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed wazuh (wazuh): 4.14.5, 5.0.0-beta2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Wazuhwazuh3.9.0 to before 4.14.5; 5.0.0-beta1 to before 5.0.0-beta24.14.5, 5.0.0-beta2Patch availableCNA
  • wazuh VendorWazuh Affected 3.9.0 to before 4.14.5; 5.0.0-beta1 to before 5.0.0-beta2 Fixed in 4.14.5, 5.0.0-beta2 Patch available CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:wazuh:wazuh:*:*:*:*:*:*:*:*3.9.0 to before 4.14.5VulnerableWazuh
cpe:2.3:a:wazuh:wazuh:5.0.0:beta1:*:*:*:*:*:*5.0.0 beta1VulnerableWazuh
  • cpe:2.3:a:wazuh:wazuh:*:*:*:*:*:*:*:* Versions 3.9.0 to before 4.14.5 Vulnerable ·Wazuh
  • cpe:2.3:a:wazuh:wazuh:5.0.0:beta1:*:*:*:*:*:* Versions 5.0.0 beta1 Vulnerable ·Wazuh

Remediation

  • Fix · CNA wazuh (wazuh) Fixed in 4.14.5, 5.0.0-beta2

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-44253

References

Exploit 1

Patch 3

  • TI-2025-17783 Remote code execution in Wazuh server KEVCVSS 3.1CRITICAL 9.9
  • TI-2026-23722 Path traversal in wazuh CVSS 3.1CRITICAL 9.9
  • TI-2024-01157 Remote code execution and local privilege escalation in Wazuh Windows agent via NetNTLMv2 hash theft CVSS 4.0CRITICAL 9.5
  • TI-2026-22556 Wazuh: Pre-auth stack-based buffer overflow in wazuh-remoted print_hex_string() due to signed char promotion on x86_64 CVSS 3.1HIGH 8.2
  • TI-2026-35598 Wazuh: cluster peer can read arbitrary master files and forge offline REST API… CVSS 3.1CRITICAL 9.1
  • TI-2026-35467 Wazuh: merged-file header path traversal in cluster sync allows arbitrary file write under WAZUH_PATH in Wazuh manager CVSS 3.1CRITICAL 9.1
See all 72 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences