Wazuh: Pre-auth stack-buffer-overflow in compare_wazuh_versions reachable from wazuh-authd (TCP/1515) via crafted enrollment V: field

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-45798
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-19 17:18:49 UTC
Updated2026-08-19 18:16:39 UTC
DescriptionWazuh 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

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

Problem Types: CWE-121 | CWE-170 | CWE-121 CWE-121: Stack-based Buffer Overflow | CWE-170 CWE-170: Improper Null Termination

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Wazuh Wazuh affected >= 4.5.0, < 4.14.6 Not specified
CNA Wazuh Wazuh affected >= 5.0.0-beta1, < 5.0.0-beta2 Not specified

References

ReferenceSourceLinkTags
github.com/wazuh/wazuh/commit/b6aac379982d6144b8da38450cbea6c8dc15be44 [email protected] github.com
github.com/wazuh/wazuh/security/advisories/GHSA-4fvp-jfc3-qr6r [email protected] github.com
github.com/wazuh/wazuh/releases/tag/v4.14.6 [email protected] github.com
github.com/wazuh/wazuh/pull/36059 [email protected] github.com
github.com/wazuh/wazuh/releases/tag/v5.0.0-beta2 [email protected] github.com
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