Adjacent-network code execution via unchecked QName copying
Published Mar 15, 2026 · Updated Mar 15, 2026
Heap-based buffer overflow in Tuya arduino-tuyaopen before 1.2.1 allows remote attackers to execute code via malicious DNS responses. The pre-fix processNextRequest loop copies attacker-controlled QName labels into a fixed-size array without bounding packet offsets, label lengths, or cumulative output length. Reachability requires an affected embedded device to accept DNS traffic from an attacker-controlled LAN DNS server; the overflow can corrupt heap memory and execute code on the device.
Summary
What happened
Heap-based buffer overflow in Tuya arduino-tuyaopen before 1.2.1 allows remote attackers to execute code via malicious DNS responses. The pre-fix processNextRequest loop copies attacker-controlled QName labels into a fixed-size array without bounding packet offsets, label lengths, or cumulative output length. Reachability requires an affected embedded device to accept DNS traffic from an attacker-controlled LAN DNS server; the overflow can corrupt heap memory and execute code on the device.
The record
- CVE
- CVE-2026-28519
- Published
- Mar 15, 2026
- Updated
- Mar 15, 2026
- Vendor
- Tuya
- Product
- arduino-tuyaopen
- Classifications
- CWE-122, T1203
- Attack vector
- adjacent
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 15, 2026CVE publishedPublication date reported by the CVE source.
- Mar 15, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <1.2.1
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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