CVE-2026-41499Public exploitNetwork attack vector

Manager crash via agent uname buffer underwrite

Published Apr 29, 2026 · Updated Apr 29, 2026

Buffer underwrite in Wazuh 4.0.0 through 4.14.3 allows remote authenticated users to crash the manager via malformed agent uname data. In parse_uname_string, four strlen(ptr)-1 expressions process empty fields without a length check, wrapping the index and writing a null byte before a heap buffer. Registered or compromised agent access is required, and the demonstrated consequence is a wazuh-remoted or wazuh-analysisd crash with heap corruption.

CVSS severity6.5
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer underwrite in Wazuh 4.0.0 through 4.14.3 allows remote authenticated users to crash the manager via malformed agent uname data. In parse_uname_string, four strlen(ptr)-1 expressions process empty fields without a length check, wrapping the index and writing a null byte before a heap buffer. Registered or compromised agent access is required, and the demonstrated consequence is a wazuh-remoted or wazuh-analysisd crash with heap corruption.

The record

CVE
CVE-2026-41499
Published
Apr 29, 2026
Updated
Apr 29, 2026
Vendor
Wazuh
Product
Wazuh
Classifications
CWE-124, CWE-191, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 29, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=>= 4.0.0, < 4.14.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Wazuh · Wazuhversion=>= 4.0.0, < 4.14.4

Published CVSS scores

6.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/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-124Buffer Underwrite ('Buffer Underflow')
CWE-191Integer Underflow (Wrap or Wraparound)
T1499Endpoint Denial of Service

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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