Medium severity · published Aug 19, 2026
CVE-2026-44254
Wazuh: Stack Out-of-Bounds Write in remoted Decompression Path
5.3
CVSS
0.5%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
High
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 42% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
WA
wazuh · wazuh
>= 1.0.0, < 4.14.6; >= 5.0.0-beta1, < 5.0.0-beta2 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-44254
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-44254
Patch
https://github.com/wazuh/wazuh/commit/96772487fbdecd43cc83e284ee7aeb45e3cfcd96
Issue Tracking
https://github.com/wazuh/wazuh/pull/35773
Release Notes
https://github.com/wazuh/wazuh/releases/tag/v4.14.6
Release Notes
https://github.com/wazuh/wazuh/releases/tag/v5.0.0-beta2
Exploit
https://github.com/wazuh/wazuh/security/advisories/GHSA-9wm4-fp6c-hqgq
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