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

Improper validation of NBNS name_len in arduino-esp32 NetBIOS leads to memory corruption

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.

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

栈缓冲区溢出

arduino-esp32 安全漏洞

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。

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