CRITICAL

CVE-2026-74040

CVSS v3

9.1

CRITICAL

EPSS Score

—

exploit probability

CISA KEV

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Neither OSV.dev nor the vendor advisories we read list affected versions for CVE-2026-74040 yet.

Full record on NVD

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.

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Published: 2026-10-13
Last Modified: 2026-10-13

Frequently asked questions

What is CVE-2026-74040?

Is CVE-2026-74040 actively exploited?

Active exploitation of CVE-2026-74040 has not been confirmed.

What is the CVSS score for CVE-2026-74040?

CVE-2026-74040 has a CVSS v3 base score of 9.1 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H.

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