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CVE-2026-45798— Wazuh: Pre-auth stack-buffer-overflow in compare_wazuh_versions reachable from wazuh-authd (TCP/1515) via crafted enrollment V: field

Quick assessment

Affected
wazuh wazuh
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Wazuh是美国Wazuh公司开源的一款安全检测与威胁分析平台。 Wazuh 4.5.0版本至4.14.6之前版本和5.0.0-beta1版本至5.0.0-beta2之前版本存在缓冲区错误漏洞，该漏洞源于compare_wazuh_versions()函数将攻击者控制的enrollment V:字段复制到10字节栈缓冲区时未显式终止缓冲区，可能导致远程拒绝服务。

CVSS 7.5 · High EPSS 0.50% · P40

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
wazuh wazuh >= 4.5.0, < 4.14.6 affected
>= 5.0.0-beta1, < 5.0.0-beta2 affected
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I. Basic Information for CVE-2026-45798

Vulnerability Information
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Vulnerability Title
Wazuh: Pre-auth stack-buffer-overflow in compare_wazuh_versions reachable from wazuh-authd (TCP/1515) via crafted enrollment V: field
Source: CVE Program / CVE List V5
Vulnerability Description
Wazuh 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
Wazuh 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Wazuh是美国Wazuh公司开源的一款安全检测与威胁分析平台。 Wazuh 4.5.0版本至4.14.6之前版本和5.0.0-beta1版本至5.0.0-beta2之前版本存在缓冲区错误漏洞，该漏洞源于compare_wazuh_versions()函数将攻击者控制的enrollment V:字段复制到10字节栈缓冲区时未显式终止缓冲区，可能导致远程拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
wazuh wazuh >= 4.5.0, < 4.14.6 -

II. Public POCs for CVE-2026-45798

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Qwen3.6-35B-A3B · 8803 chars
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III. Intelligence Information for CVE-2026-45798

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Patches & Fixes for CVE-2026-45798 (2)

Vendor Advisories for CVE-2026-45798 (1)

Vendor Pages for CVE-2026-45798 (2)

Same Patch Batch · wazuh · 2026-08-19 · 13 CVEs total

CVE-2026-48162 9.1 CRITICAL Wazuh: cluster peer can read arbitrary master files and forge offline REST API administrat
CVE-2026-48024 9.1 CRITICAL Wazuh: merged-file header path traversal in cluster sync allows arbitrary file write under
CVE-2026-49441 9.1 CRITICAL Wazuh : peer-controlled metadata key in process_files_from_worker non-merged branch allows
CVE-2026-44901 8.4 HIGH Wazuh Cluster DAPI Protocol Deserialization of Untrusted Data Remote Code Execution Vulner
CVE-2026-41424 8.2 HIGH Wazuh: Privilege Escalation via Admin-Protection Bypass in update-user API Endpoint
CVE-2026-44252 7.7 HIGH Wazuh Manager dapi RBAC Bypass Allows Privilege Escalation
CVE-2026-46343 7.5 HIGH Wazuh: Arbitrary File Deletion via Cluster Protocol – Incomplete Path Validation in end_re
CVE-2026-44254 5.3 MEDIUM Wazuh: Stack Out-of-Bounds Write in remoted Decompression Path
CVE-2026-44256 5.3 MEDIUM Wazuh: CRLF Log Injection via Unsanitized Basic-Auth Username
CVE-2026-44255 5.3 MEDIUM Wazuh: Username Enumeration via Timing Side-Channel
CVE-2026-49392 5.3 MEDIUM Wazuh: Local SQL injection in FIM db due to path lookup interpolation in wazuh-syscheckd
CVE-2026-44253 4.9 MEDIUM Wazuh: Cluster Protocol Memory Exhaustion (DoS) via unbounded receive_str allocation and d

IV. Related Vulnerabilities

Same product: wazuh
Same vendor: wazuh
Same weakness: CWE-121

V. Comments for CVE-2026-45798

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