Critical severity · published Oct 13, 2026
CVE-2026-74040
Wazuh 3.9.0 before 4.14.8 Arbitrary File Overwrite RCE via process_files_from_worker
9.1
CVSS
0.7%
EPSS
No
On KEV
Description
Wazuh versions from 3.9.0 before 4.14.8 contain an arbitrary file overwrite vulnerability in MasterHandler.process_files_from_worker allowing a cluster worker to overwrite protected master files. Attackers controlling a worker can use a trailing-slash basename bypass and missing extra_valid enforcement to overwrite ossec.conf and agent.conf, achieving root remote code execution across the manager and every agent.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 54% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
WA
wazuh-manager · Wazuh
3.9.0 before 4.14.8 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-74040
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-74040
vendor-advisory
https://github.com/wazuh/wazuh/security/advisories/GHSA-88p6-7cm8-xwj8
patch
https://github.com/wazuh/wazuh/releases/tag/v4.14.8
third-party-advisory
https://www.vulncheck.com/advisories/wazuh-3.9.0-before-4.14.8-arbitrary-file-overwrite-rce-via-process-files-from-worker
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