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CVE-2026-26204— Wazuh: Heap-based NULL WRITE Buffer Underflow in GetAlertData

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Wazuh开源的一个应用软件。用于收集，汇总，索引和分析安全数据，帮助组织检测入侵，威胁和行为异常。 Wazuh 1.0.0版本至4.14.4之前版本存在安全漏洞，该漏洞源于GetAlertData中基于堆的越界写入，可能导致拒绝服务或堆损坏。

CVSS 4.4 · Medium EPSS 0.18% · P7

Affected Version Matrix 1

VendorProduct Version RangeStatus
wazuh wazuh >= 1.0.0, < 4.14.4 affected
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I. Basic Information for CVE-2026-26204

Vulnerability Information
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Vulnerability Title
Wazuh: Heap-based NULL WRITE Buffer Underflow in GetAlertData
Source: CVE Program / CVE List V5
Vulnerability Description
Wazuh is a free and open source platform used for threat prevention, detection, and response. From version 1.0.0 to before version 4.14.4, a heap-based out-of-bounds WRITE occurs in GetAlertData, resulting in writing a NULL byte exactly 1 byte before the start of the buffer allocated by strdup. Due to unsigned integer underflow and pointer arithmetic wrapping, the write lands at offset -1 from the buffer, corrupting heap metadata. A malicious actor can potentially leverage this issue through a compromised agent to cause denial of service or heap corruption by injecting a specially crafted alert into the alerts log file monitored by wazuh-logcollector. This issue has been patched in version 4.14.4.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
缓冲区下溢
Source: CVE Program / CVE List V5
Vulnerability Title
Wazuh 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Wazuh是Wazuh开源的一个应用软件。用于收集，汇总，索引和分析安全数据，帮助组织检测入侵，威胁和行为异常。 Wazuh 1.0.0版本至4.14.4之前版本存在安全漏洞，该漏洞源于GetAlertData中基于堆的越界写入，可能导致拒绝服务或堆损坏。
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 >= 1.0.0, < 4.14.4 -

II. Public POCs for CVE-2026-26204

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III. Intelligence Information for CVE-2026-26204

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Vendor Advisories for CVE-2026-26204 (1)

Vendor Pages for CVE-2026-26204 (1)

Same Patch Batch · wazuh · 2026-04-29 · 5 CVEs total

CVE-2026-30893 9.0 CRITICAL Wazuh cluster sync path traversal in decompress_files() enables arbitrary file write and c
CVE-2026-26206 6.5 MEDIUM Wazuh: API brute-force protection bypass via race condition in login attempt tracking
CVE-2026-41499 6.5 MEDIUM Wazuh: Multiple Heap-based NULL WRITE Buffer Underflows in parse_uname_string()
CVE-2026-28221 6.5 MEDIUM Wazuh: Pre-auth stack-based buffer overflow in wazuh-remoted print_hex_string() due to sig

IV. Related Vulnerabilities

Same product: wazuh
Same vendor: wazuh
Same weakness: CWE-124

V. Comments for CVE-2026-26204

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