Buffer overflow in Wazuh
CVE-2026-44254
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.005 (40.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 40.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.005 · change: +0.001
Affected products
- Wazuh — versions 5.0.0, >= 5.0.0-beta1, < 5.0.0-beta2, >= 1.0.0, < 4.14.6
Weakness classification (CWE)
References
- github.com/wazuh/wazuh/commit/96772487fbdecd43cc83e284ee7aeb45e3cfcd96 (Patch)
- github.com/wazuh/wazuh/pull/35773 (Patch, Issue Tracking)
- github.com/wazuh/wazuh/releases/tag/v4.14.6 (Release Notes)
- github.com/wazuh/wazuh/releases/tag/v5.0.0-beta2 (Release Notes)
- github.com/wazuh/wazuh/security/advisories/GHSA-9wm4-fp6c-hqgq (Exploit, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-44254?
- CVE-2026-44254 is a medium-severity vulnerability in Wazuh, classified under Incorrect Calculation of Buffer Size. CVSS score: 5.3/10. Published 2026-08-19.
- How severe is CVE-2026-44254?
- Medium severity. CVSS v3 base score is 5.3 out of 10.