Description
Wazuh is a free and open source platform used for threat prevention, detection, and response. From 1.0.0 until 4.14.6 and 5.0.0-beta2, HandleSecureMessage() in src/remoted/secure.c passes a pointer inside its stack buffer to ReadSecMSG(), and src/os_crypto/shared/msgs.c decompresses up to OS_MAXSTR bytes at that offset. For an encrypted agent message on TCP port 1514 that expands to 65,536 bytes, os_zlib_uncompress() writes a terminating null byte beyond the end of the destination buffer. The resulting stack out-of-bounds write in the root-level remoted daemon can crash message processing and disrupt agent communications. This issue is fixed in versions 4.14.6 and 5.0.0-beta2.
Affected products
wazuh: wazuh
References5
- github.com/wazuh/wazuh/security/advisories/GHSA-9wm4-fp6c-hqgq ExploitVendor Advisory
- github.com/wazuh/wazuh/commit/96772487fbdecd43cc83e284ee7aeb45e… Patch
- github.com/wazuh/wazuh/pull/35773 Issue TrackingPatch
- github.com/wazuh/wazuh/releases/tag/v4.14.6 Release Notes
- github.com/wazuh/wazuh/releases/tag/v5.0.0-beta2 Release Notes
Metrics
- CVSS 3.1
-
5.3
MEDIUM
Score source: CNA
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H - EPSS — exploit probability
- 0% percentile: 43 · as of 10 November 2026
- CWE
- CWE-131CWE-787
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.