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CVE-2026-41429— Improper validation of NBNS name_len in arduino-esp32 NetBIOS leads to memory corruption

Quick assessment

Affected
espressif arduino-esp32
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.

arduino-esp32是Espressif开源的一个用于 ESP32、ESP32-S2、ESP32-S3、ESP32-C3、ESP32-C6 和 ESP32-H2 的 Arduino 内核。 arduino-esp32 3.3.8之前版本存在安全漏洞，该漏洞源于NBNS数据包处理路径中存在远程可访问的内存损坏问题，请求解析器信任攻击者控制的name_len字段而未强制执行与固定大小目标缓冲区一致的边界。

CVSS 8.8 · High EPSS 0.34% · P26

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-41429

Vulnerability Information
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Vulnerability Title
Improper validation of NBNS name_len in arduino-esp32 NetBIOS leads to memory corruption
Source: CVE Program / CVE List V5
Vulnerability Description
arduino-esp32 is an Arduino core for the ESP32, ESP32-S2, ESP32-S3, ESP32-C3, ESP32-C6 and ESP32-H2 microcontrollers. Prior to 3.3.8, there is a remotely reachable memory corruption issue in the NBNS packet handling path. When NetBIOS is enabled by calling NBNS.begin(...), the device listens on UDP port 137 and processes untrusted NBNS requests from the local network. The request parser trusts the attacker-controlled name_len field without enforcing a bound consistent with the fixed-size destination buffers used later in the flow. This vulnerability is fixed in 3.3.8.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
arduino-esp32 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
arduino-esp32是Espressif开源的一个用于 ESP32、ESP32-S2、ESP32-S3、ESP32-C3、ESP32-C6 和 ESP32-H2 的 Arduino 内核。 arduino-esp32 3.3.8之前版本存在安全漏洞，该漏洞源于NBNS数据包处理路径中存在远程可访问的内存损坏问题，请求解析器信任攻击者控制的name_len字段而未强制执行与固定大小目标缓冲区一致的边界。
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
espressif arduino-esp32 < 3.3.8 -

II. Public POCs for CVE-2026-41429

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III. Intelligence Information for CVE-2026-41429

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Vendor Advisories for CVE-2026-41429 (1)

IV. Related Vulnerabilities

Same product: arduino-esp32
Same vendor: espressif
Same weakness: CWE-121

V. Comments for CVE-2026-41429

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