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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Espressif | Arduino-Esp32 | < 3.3.8 |
| Espressif | Esp32 | - |
| Espressif | Esp32-C3 | - |
| Espressif | Esp32-C6 | - |
| Espressif | Esp32-H2 | - |
| Espressif | Esp32-S2 | - |
| Espressif | Esp32-S3 | - |
Related Weaknesses (CWE)
References
- https://github.com/espressif/arduino-esp32/security/advisories/GHSA-92j9-c75g-2cExploitVendor Advisory
- https://github.com/espressif/arduino-esp32/security/advisories/GHSA-92j9-c75g-2cExploitVendor Advisory
FAQ
What is CVE-2026-41429?
CVE-2026-41429 is a vulnerability with a CVSS score of 8.8 (HIGH). 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 ...
How severe is CVE-2026-41429?
CVE-2026-41429 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-41429?
Check the references section above for vendor advisories and patch information. Affected products include: Espressif Arduino-Esp32, Espressif Esp32, Espressif Esp32-C3, Espressif Esp32-C6, Espressif Esp32-H2.