Wazuh is a free and open source platform used for threat prevention, detection, and response. From 4.5.0 until 4.14.6 and 5.0.0-beta2, compare_wazuh_versions() in src/shared/version_op.c copies the attacker-controlled enrollment V: field into a 10-byte stack buffer with strncpy() but does not explicitly terminate the buffer. The function is reachable before authentication through wazuh-authd on TCP port 1515 when anonymous TLS enrollment is enabled. A version string of at least nine non-null bytes can cause strchr() and strtok() to read beyond ver2 and can make strtok() write a null byte into adjacent stack memory, allowing a remote denial of service. This issue is fixed in versions 4.14.6 and 5.0.0-beta2.
Advisories

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Fixes

Solution

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Workaround

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History

Wed, 19 Aug 2026 19:15:00 +0000

Type Values Removed Values Added
First Time appeared Wazuh
Wazuh wazuh
Vendors & Products Wazuh
Wazuh wazuh

Wed, 19 Aug 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 19 Aug 2026 16:30:00 +0000

Type Values Removed Values Added
Description Wazuh is a free and open source platform used for threat prevention, detection, and response. From 4.5.0 until 4.14.6 and 5.0.0-beta2, compare_wazuh_versions() in src/shared/version_op.c copies the attacker-controlled enrollment V: field into a 10-byte stack buffer with strncpy() but does not explicitly terminate the buffer. The function is reachable before authentication through wazuh-authd on TCP port 1515 when anonymous TLS enrollment is enabled. A version string of at least nine non-null bytes can cause strchr() and strtok() to read beyond ver2 and can make strtok() write a null byte into adjacent stack memory, allowing a remote denial of service. This issue is fixed in versions 4.14.6 and 5.0.0-beta2.
Title Wazuh: Pre-auth stack-buffer-overflow in compare_wazuh_versions reachable from wazuh-authd (TCP/1515) via crafted enrollment V: field
Weaknesses CWE-121
CWE-170
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-08-19T17:20:26.591Z

Reserved: 2026-05-13T08:19:32.603Z

Link: CVE-2026-45798

cve-icon Vulnrichment

Updated: 2026-08-19T17:19:19.872Z

cve-icon NVD

Status : Received

Published: 2026-08-19T17:18:49.730

Modified: 2026-08-19T18:16:39.973

Link: CVE-2026-45798

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-19T19:00:04Z

Weaknesses