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CVE-2026-54084— Wazuh agent enrollment NULL pointer dereference via malformed manager response

Quick assessment

Affected
wazuh wazuh
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
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 4.0.0版本至4.14.6版本存在异常处理不当漏洞，该漏洞源于恶意或中间人注册管理器返回少于四个字段的错误密钥响应时未验证所有字段存在，导致空指针取消引用，可能造成代理崩溃和拒绝服务。

CVSS 5.3 · Medium EPSS 0.20% · P9

Affected Version Matrix 1

VendorProduct Version RangeStatus
wazuh wazuh >= 4.0.0, < 4.14.7 affected
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I. Basic Information for CVE-2026-54084

Vulnerability Information
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Vulnerability Title
Wazuh agent enrollment NULL pointer dereference via malformed manager response
Source: CVE Program / CVE List V5
Vulnerability Description
Wazuh is an open-source security platform providing unified XDR and SIEM protection for endpoints and cloud workloads. In versions 4.0.0 through 4.14.6, a malicious or man-in-the-middle enrollment manager can crash a Wazuh agent during enrollment by returning a malformed key response with fewer than four fields, causing a NULL pointer dereference. The  w_enrollment_process_agent_key()  routine splits the manager-provided key into four space-separated fields but does not verify that all fields are present before passing them to validators. Because OS_StrBreak() leaves missing trailing entries as NULL and OS_IsValidName() calls strlen() on its argument without a NULL check, a response such as  OSSEC K:'1'  reaches OS_IsValidName(NULL) and terminates the agent process. Since Wazuh permits enrollment against an unverified manager when no CA certificate is configured, an attacker operating a rogue manager or intercepting the enrollment flow can deterministically crash agents, resulting in denial of service. This issue is fixed in version 4.14.7.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5
Vulnerability Title
Wazuh 异常处理不当漏洞
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 4.0.0版本至4.14.6版本存在异常处理不当漏洞，该漏洞源于恶意或中间人注册管理器返回少于四个字段的错误密钥响应时未验证所有字段存在，导致空指针取消引用，可能造成代理崩溃和拒绝服务。
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 >= 4.0.0, < 4.14.7 -

II. Public POCs for CVE-2026-54084

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III. Intelligence Information for CVE-2026-54084

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Patches & Fixes for CVE-2026-54084 (1)

Vendor Advisories for CVE-2026-54084 (1)

Same Patch Batch · wazuh · 2026-08-27 · 6 CVEs total

CVE-2026-61800 9.1 CRITICAL Wazuh cluster worker file sync allows arbitrary file write under /var/ossec (incomplete fi
CVE-2026-54083 8.1 HIGH Wazuh: Path traversal in ip-customblock active response allows arbitrary file creation and
CVE-2026-54085 7.1 HIGH Wazuh: Missing input validation in multiple active response scripts allows argument inject
CVE-2026-61783 7.0 HIGH Wazuh: RBAC permission-effect check in mask_sensitive_config allows low-privilege users to
CVE-2026-61802 6.5 MEDIUM Wazuh discloses cleartext cluster key to low-privilege API users via GET /cluster/local/co

IV. Related Vulnerabilities

Same product: wazuh
Same vendor: wazuh
Same weakness: CWE-476

V. Comments for CVE-2026-54084

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