CVE-2026-26204— Wazuh: Heap-based NULL WRITE Buffer Underflow in GetAlertData
Possible ATT&CK Techniques 2AI
T1499 · Endpoint Denial of Service T1203 · Exploitation for Client ExecutionGet alerts for future matching vulnerabilitiesLog in to subscribe
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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
缓冲区下溢
Source: NVD (National Vulnerability Database)
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
II. Public POCs for CVE-2026-26204
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Vendor Advisories for CVE-2026-26204 (1)
Vendor Pages for CVE-2026-26204 (1)
- Release Wazuh v4.14.4 · wazuh/wazuh · GitHubx_refsource_MISC
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
- CVE-2026-41499
Wazuh: Multiple Heap-based NULL WRITE Buffer Underflows in p - CVE-2026-30893
Wazuh cluster sync path traversal in decompress_files() enab - CVE-2026-28221
Wazuh: Pre-auth stack-based buffer overflow in wazuh-remoted - CVE-2026-26206
Wazuh: API brute-force protection bypass via race condition - CVE-2023-7340
Wazuh authd service (os_auth) Heap-based Buffer Overflow
Same vendor: wazuh
- CVE-2026-41499
Wazuh: Multiple Heap-based NULL WRITE Buffer Underflows in p - CVE-2026-30893
Wazuh cluster sync path traversal in decompress_files() enab - CVE-2026-28221
Wazuh: Pre-auth stack-based buffer overflow in wazuh-remoted - CVE-2026-26206
Wazuh: API brute-force protection bypass via race condition - CVE-2025-15612
Wazuh Provisioning Scripts / Build Infrastructure Improper C
V. Comments for CVE-2026-26204
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