What’s Vulnerable › Vulnerabilities

CVE-2026-28519: arduino-TuyaOpen DnsServer Heap-Based Buffer Overflow Remote Code Execution

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-16 · updated 2026-06-17
• Weakness: CWE-122

Description

arduino-TuyaOpen before version 1.2.1 contains a heap-based buffer overflow vulnerability in the DnsServer component. An attacker on the same local area network who controls the LAN DNS server can send malicious DNS responses to overflow the heap buffer, potentially allowing execution of arbitrary code on affected embedded devices.

Affected products

• Tuya arduino-TuyaOpen: before 1.2.1 — fixed in 1.2.1

How to fix

Upgrade to a fixed version: Tuya arduino-TuyaOpen 1.2.1. Check the vendor advisory for mitigations.

References

• https://github.com/tuya/arduino-TuyaOpen
• https://src.tuya.com/announcement/32
• https://www.vulncheck.com/advisories/arduino-tuyaopen-dnsserver-heap-based-buffer-overflow-remote-code-execution

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