CVE-2026-25508 ESF-IDF Has Memory Safety Vulnerabilities in BLE Provisioning
Remote attackers can trigger memory corruption in Espressif IoT devices during BLE provisioning via out-of-bounds reads, potentially leading to code execution or crashes.
- 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-2026-25508?
CVE-2026-25508 is a medium-severity memory corruption 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, an out-of-bounds read vulnerability was reported in the BLE ATT Prepare Write handling of the BLE provisioning transport (protocomm_ble). The issue can be triggered by a remote BLE client while the device is in provisioning mode. The transport accumulated prepared-write fragments in a fixed-size buffer but incorrectly tracked the cumulative length. By sending repeated prepare write requests with overlapping offsets, a remote client could cause the reported length to exceed the allocated buffer size. This inflated length was then passed to provisioning handlers during execute-write processing, resulting in an out-of-bounds read and potential memory corruption. 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-125
Which versions are affected by CVE-2026-25508?
It affects 1 product.
Products include Espressif Esp-Idf.
How do I fix CVE-2026-25508?
No fix has been published for CVE-2026-25508 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-25508 being exploited?
There is no known exploitation of CVE-2026-25508 in the wild and no public exploit code.
Other vulnerabilities in espressif esp-idf
Sources
Also known as GHSA-9j5x-rf36-54x9.