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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 是一个开源安全平台，为端点和云工作负载提供统一的 XDR 和 SIEM 防护。在 Wazuh 4.0.0 至 4.14.6 版本中，恶意或“中间人”式注册管理器可以通过返回格式错误（少于四个字段的）密钥响应，导致 Wazuh 代理在注册过程中崩溃，从而引发空指针解引用错误。具体而言， 函数会将管理器提供的密钥拆分为四个以空格分隔的字段，但在将它们传递给验证器之前，并未验证所有字段是否齐全。由于 会将缺失的尾部条目置为 NULL，而 在调用 时未对参数进行 NULL 检查，因此像 这样的响应会执行到 ，导

CVSS 5.3 · Medium
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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

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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