CVE-2026-74030 PUBLISHED

Wazuh 3.9.0 before 4.14.8 Memory Exhaustion via SCA YAML Alias Expansion

Assigner: VulnCheck
Reserved: 14.08.2026 Published: 13.10.2026 Updated: 13.10.2026

Wazuh from 3.9.0 before 4.14.8 contains an uncontrolled YAML alias expansion vulnerability in yaml2json_node that allows a manager-controlled policy to exhaust agent memory. Attackers controlling the manager can push a small SCA policy with nested aliases via merged.mg to OOM-kill wazuh-modulesd on every agent in a group.

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CVSS Score: 6.9

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	None	Availability	High	Availability	None
Privileges Required	High
User Interaction	None

CVSS 4.0

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

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	None
Privileges Required	High	Integrity Impact	None
User Interaction	None	Availability Impact	High

CVSS 3.1

Product Status

Vendor	Wazuh
Product	wazuh-agent
Versions	Default: unaffected affected from 3.9.0 to 4.14.8 (excl.) Version 4.14.8 is unaffected

Vendor	Wazuh
Product	wazuh-manager
Versions	Default: unaffected affected from 3.9.0 to 4.14.8 (excl.) Version 4.14.8 is unaffected

Credits

karasu-hakira reporter
vikman90 analyst

References

Problem Types

Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion') CWE