Is CVE-2026-45328 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-45328 being exploited in the wild.

How severe is CVE-2026-45328?

Critical severity, with a CVSS score of 9.3, published 10 June 2026.

Which products and versions are affected?

Espressif Systems ESP-IDF 5.5.4, 6.0.

Is there a fix for CVE-2026-45328?

A patch was published on 2026-04-09: Fixes committed to GitHub repository Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-45328 attacked?

It is attacked with local access, in device firmware.

Am I affected by CVE-2026-45328?

Check whether you run Espressif Systems ESP-IDF at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-45328: Espressif ESP-IDF out-of-bounds write in esp_tee component

CVE-2026-45328 · Severity: critical · CVSS 9.3 · Published 2026-06-10

A security vulnerability exists in the Espressif IoT Development Framework (ESP-IDF), specifically within the component that manages secure operations. This flaw could allow an attacker to bypass security boundaries intended to protect sensitive hardware and data, such as encryption keys and secure storage. If exploited, it could lead to unauthorized access to protected information or the ability to modify critical system firmware.

Technologies: Espressif Systems ESP-IDF. Vendors: Espressif Systems.

Quick answers

Is CVE-2026-45328 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-45328 being exploited in the wild.
How severe is CVE-2026-45328?: Critical severity, with a CVSS score of 9.3, published 10 June 2026.
Which products and versions are affected?: Espressif Systems ESP-IDF 5.5.4, 6.0.
Is there a fix for CVE-2026-45328?: A patch was published on 2026-04-09: Fixes committed to GitHub repository Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-45328 attacked?: It is attacked with local access, in device firmware.
Am I affected by CVE-2026-45328?: Check whether you run Espressif Systems ESP-IDF at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The vulnerability (CWE-20, CWE-787) exists in the esp_tee component of ESP-IDF versions 5.5.4 and 6.0. The issue stems from missing input validation in secure-service wrappers within esp_secure_services.c and esp_secure_services_iram.c, which bridge calls from the Rich Execution Environment (REE) to the Trusted Execution Environment (TEE). Specifically, a potential integer overflow in OTA write bounds checking and an unprotected service call table in DRAM allowed for memory corruption or unauthorized service execution. Attackers can exploit this to gain access to TEE-protected hardware (AES, SHA, ECC) and security features like attestation and secure storage. Patches are available in versions 5.5.5 and 6.0.1.

Affected products

Espressif Systems ESP-IDF 5.5.4, 6.0

Timeline

2026-06-10: advisory: NVD publication date
2026-04-09: patched: Fixes committed to GitHub repository

References

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