CVE-2026-25507 ESF-IDF Has Use-after-free Vulnerability in BLE Provisioning

Medium 6.3 Published 4 Feb 2026 Updated 4 Feb 2026

A remote attacker can trigger a use-after-free in BLE provisioning, potentially causing crashes or executing code on affected IoT devices.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2026-25507?

CVE-2026-25507 is a medium-severity use after free vulnerability in espressif esp-idf, published on 4 Feb 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official description

ESF-IDF is the Espressif Internet of Things (IOT) Development Framework. In versions 5.5.2, 5.4.3, 5.3.4, 5.2.6, and 5.1.6, a use-after-free vulnerability was reported in the BLE provisioning transport (protocomm_ble) layer. The issue can be triggered by a remote BLE client while the device is in provisioning mode. The vulnerability occurred when provisioning was stopped with keep_ble_on = true. In this configuration, internal protocomm_ble state and GATT metadata were freed while the BLE stack and GATT services remained active. Subsequent BLE read or write callbacks dereferenced freed memory, allowing a connected or newly connected client to trigger invalid memory acces. This issue has been patched in versions 5.5.3, 5.4.4, 5.3.5, 5.2.7, and 5.1.7.

Weakness: CWE-416

Which versions are affected by CVE-2026-25507?

It affects 1 product.

Products include Espressif Esp-Idf.

How do I fix CVE-2026-25507?

No fix has been published for CVE-2026-25507 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.

Is CVE-2026-25507 being exploited?

There is no known exploitation of CVE-2026-25507 in the wild and no public exploit code.

Sources

Also known as GHSA-h7r3-gmg9-xjmg.