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TI-2026-50121 Aliases CVE-2026-71540

Wazuh Manager cluster header parsing allows pre-authentication memory exhaustion

Priority HIGH 72CWE-770Published · Updated

Key facts

Attack vector
Network
Privileges required
None
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 an open-source security platform providing unified XDR and SIEM protection for endpoints and cloud workloads. From 3.9.0 until 4.14.7, wazuh-clusterd in framework/wazuh/core/cluster/common.py allocates a payload buffer using the size declared in a 20-byte cluster protocol header before Fernet decryption validates the peer. An unauthenticated network peer can declare a payload of up to 256 MiB, stop sending after the header, and retain that allocation until the TCP connection closes. The cluster listener has no application-level per-source connection budget in affected versions, allowing concurrent sockets to multiply memory consumption and potentially terminate the cluster process, disrupt synchronization, and interrupt distributed API forwarding. This issue is fixed in version 4.14.7.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00425 37th percentileScored 2026-11-08
Fix Fixed wazuh (wazuh): 4.14.7

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
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 4.14.74.14.7Patch availableCNA
  • wazuh VendorWazuh Affected 3.9.0 to before 4.14.7 Fixed in 4.14.7 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:wazuh:wazuh:*:*:*:*:*:*:*:*——Wazuh
  • cpe:2.3:a:wazuh:wazuh:*:*:*:*:*:*:*:* Versions — — ·Wazuh

Remediation

  • Fix · CNA wazuh (wazuh) Fixed in 4.14.7

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-71540

References

Other 4

  • TI-2025-17783 Remote code execution in Wazuh server KEVCVSS 3.1CRITICAL 9.9
  • TI-2026-47604 Wazuh GitHub Actions Shell Injection via Fork Pull Request CVSS 4.0CRITICAL 9.3
  • TI-2026-71739 Missing origin check in Wazuh manager allows arbitrary file read CVSS 4.0HIGH 8.7
  • TI-2026-71743 Arbitrary file overwrite in Wazuh manager enables root code execution CVSS 4.0CRITICAL 9.4
  • 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
See all 101 →

Sources

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