CVE-2026-44253Public exploitNetwork attack vector

Authenticated service disruption via unbounded cluster allocations

Published Aug 19, 2026 · Updated Aug 25, 2026

Uncontrolled resource consumption in Wazuh Manager 3.9.0 through 4.14.4 and 5.0.0-beta1 allows remote authenticated users to disrupt services. The receive_str() method trusts a peer-supplied total when allocating InBuffer, while div_msg_box retains unfinished fragments without size, count, or expiry limits. Access requires the cluster Fernet key from a worker node, and exhaustion on the master interrupts agent connectivity and alert processing.

CVSS severity4.9
Medium
EPSS probability0.51%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled resource consumption in Wazuh Manager 3.9.0 through 4.14.4 and 5.0.0-beta1 allows remote authenticated users to disrupt services. The receive_str() method trusts a peer-supplied total when allocating InBuffer, while div_msg_box retains unfinished fragments without size, count, or expiry limits. Access requires the cluster Fernet key from a worker node, and exhaustion on the master interrupts agent connectivity and alert processing.

The record

CVE
CVE-2026-44253
Published
Aug 19, 2026
Updated
Aug 25, 2026
Vendor
Wazuh
Product
Wazuh
Classifications
CWE-789, CWE-400, T1499.003
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 3.9.0, < 4.14.5
  2. Affected versionversion=>= 5.0.0-beta1, < 5.0.0-beta2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Wazuh · Wazuhversion=>= 3.9.0, < 4.14.5; version=>= 5.0.0-beta1, < 5.0.0-beta2

Published CVSS scores

4.9GitHubCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-789Memory Allocation with Excessive Size Value
CWE-400Uncontrolled Resource Consumption
T1499.003Application Exhaustion Flood

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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