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Vulnerability record · CVE-2026-45798 · published 19 August 2026

CVE-2026-45798: Wazuh stack-based buffer overflow vulnerability

Wazuh · Wazuh

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.

7.5 CVSS 3.1 High EPSS 0.92% · top 41.4% CWE-121 · Stack-based buffer overflowCWE-170 · CWE-170
7.5CVSS 3.1 base score
0.92%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References, 1 tagged exploit
15 Sep 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/wazuh/wazuh/commit/b6aac379982d6144b8da38450cbea6c8dc15be44 Patch
https://github.com/wazuh/wazuh/pull/36059 Issue TrackingPatch
https://github.com/wazuh/wazuh/releases/tag/v4.14.6 PatchRelease Notes
https://github.com/wazuh/wazuh/releases/tag/v5.0.0-beta2 PatchRelease Notes
https://github.com/wazuh/wazuh/security/advisories/GHSA-4fvp-jfc3-qr6r ExploitVendor Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-45798), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.