CVE-2026-44254

Wazuh: Stack Out-of-Bounds Write in remoted Decompression Path

State: Published
Severity: 5.3 Medium
Published: Aug 19, 2026
Updated: Aug 19, 2026
Reserved: May 5, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	5.3 Medium	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H	GitHub_M

Weaknesses

CWE-131 Incorrect Calculation of Buffer Size
CWE-787 Out-of-bounds Write

Affected Products

Product	Versions
wazuhwazuh	>= 1.0.0, < 4.14.6Affected >= 5.0.0-beta1, < 5.0.0-beta2Affected

References

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