Espressif ESP-IDF esp_tee RCE via insecure wrappers 5.5.4/6.0 (fixed 5.5.5/6.0.1)
CVE-2026-45328 Published on June 10, 2026
ESF-IDF: Out-of-Bounds Write in ESP-TEE Secure Service Wrappers
ESF-IDF is the Espressif Internet of Things (IOT) Development Framework. In versions 5.5.4 and 6.0, the esp_tee component exposes secure-service wrappers in esp_secure_services.c and esp_secure_services_iram.c that bridge calls from the user application (i.e. the REE) to TEE-protected hardware peripherals (AES, SHA, ECC, HMAC, SPI, MMU, WDT) and to the security feature like attestation, OTA updates, secure storage. This issue has been patched in versions 5.5.5 and 6.0.1.
Vulnerability Analysis
CVE-2026-45328 is exploitable with local system access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be critical as this vulnerability has a high impact to the confidentiality, integrity and availability of this component.
Weakness Types
Improper Input Validation
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
What is a Memory Corruption Vulnerability?
The software writes data past the end, or before the beginning, of the intended buffer. Typically, this can result in corruption of data, a crash, or code execution. The software may modify an index or perform pointer arithmetic that references a memory location that is outside of the boundaries of the buffer. A subsequent write operation then produces undefined or unexpected results.
CVE-2026-45328 has been classified to as a Memory Corruption vulnerability or weakness.
Products Associated with CVE-2026-45328
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Affected Versions
espressif esp-idf:- Version = 5.5.4 is affected.
- Version = 6.0 is affected.