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CVE-2026-41499— Wazuh: Multiple Heap-based NULL WRITE Buffer Underflows in parse_uname_string()

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 4.0.0版本至4.14.4之前版本存在安全漏洞，该漏洞源于parse_uname_string函数中存在多个基于堆的越界写入漏洞，该函数处理来自代理的操作系统识别数据，在4个位置存在危险代码模式，当字符串为空时strlen返回0，0减1因无符号整数下溢导致SIZE_MAX，指针算术环绕使SIZE_MAX变为-1，导致在分配缓冲区前1字节处写入，破坏堆元数据，可能导致堆损坏。

CVSS 6.5 · Medium EPSS 0.45% · P36

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
wazuh wazuh >= 4.0.0, < 4.14.4 affected
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I. Basic Information for CVE-2026-41499

Vulnerability Information
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Vulnerability Title
Wazuh: Multiple Heap-based NULL WRITE Buffer Underflows in parse_uname_string()
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 4.0.0 to before version 4.14.4, multiple heap-based out-of-bounds WRITE vulnerabilities exist in parse_uname_string() (remoted_op.c). This function processes OS identification data from agents and contains a dangerous code pattern that appears in 4 locations within the same function: writing to strlen(ptr) - 1 without checking for empty strings. When the string is empty, strlen() returns 0, and 0 - 1 wraps to SIZE_MAX due to unsigned integer underflow. Due to pointer arithmetic wrapping, SIZE_MAX effectively becomes -1, causing a write exactly 1 byte before the allocated buffer. This corrupts heap metadata (e.g., the chunk size field in glibc malloc), leading to heap corruption. This issue has been patched in version 4.14.4.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/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 4.0.0版本至4.14.4之前版本存在安全漏洞，该漏洞源于parse_uname_string函数中存在多个基于堆的越界写入漏洞，该函数处理来自代理的操作系统识别数据，在4个位置存在危险代码模式，当字符串为空时strlen返回0，0减1因无符号整数下溢导致SIZE_MAX，指针算术环绕使SIZE_MAX变为-1，导致在分配缓冲区前1字节处写入，破坏堆元数据，可能导致堆损坏。
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 >= 4.0.0, < 4.14.4 -

II. Public POCs for CVE-2026-41499

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III. Intelligence Information for CVE-2026-41499

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Vendor Advisories for CVE-2026-41499 (1)

Vendor Pages for CVE-2026-41499 (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-2026-28221 6.5 MEDIUM Wazuh: Pre-auth stack-based buffer overflow in wazuh-remoted print_hex_string() due to sig
CVE-2026-26204 4.4 MEDIUM Wazuh: Heap-based NULL WRITE Buffer Underflow in GetAlertData

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-41499

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