Vulnerability · Published Jun 10, 2026 · Assigned by GitHub_M
CVE-2026-45542ESF-IDF: Heap buffer overflow in protocomm Security2 over Bluetooth
High 7.1
In plain English
A high-severity heap buffer overflow in esp-idf from espressif. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 26% of all known vulnerabilities).
Official description
ESF-IDF is the Espressif Internet of Things (IOT) Development Framework. In versions 5.2.6, 5.3.5, 5.4.4, 5.5.4, and 6.0, a heap buffer overflow exists in the Security Scheme 2 (SRP6a) session-setup path of the protocomm component. The first-phase handler (handle_session_command0() in components/protocomm/src/security/security2.c) trusts the length of a client-supplied protobuf field for the SRP6a username and copies it into a buffer whose size is derived from a narrower destination type. The resulting truncation-versus-copy asymmetry corrupts the heap when an oversized value is supplied. This issue has been patched in versions 5.2.7, 5.3.6, 5.4.5, 5.5.5, and 6.0.1.
Affected products (as reported)
Weakness: CWE-122 · Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
References
- https://github.com/espressif/esp-idf/security/advisories/GHSA-9r76-858f-v6jh x_refsource_CONFIRM
- https://github.com/espressif/esp-idf/commit/0ea58d79845ad674d0358d5de246015a68c4cb4f x_refsource_MISC
- https://github.com/espressif/esp-idf/commit/56c3e385611e63162d0f2f8504ac4ae2ccfccef0 x_refsource_MISC
- https://github.com/espressif/esp-idf/commit/71eb2dbe6aaef830719ecac8edf409e2992b64b2 x_refsource_MISC
- https://github.com/espressif/esp-idf/commit/9b4cacf9cbc69379972de6a2247fcf5af9240961 x_refsource_MISC
- https://github.com/espressif/esp-idf/commit/a2f4554f10ba075c98cbc67464db096ba32497cf x_refsource_MISC
- https://github.com/espressif/esp-idf/commit/f5d24a7e919bc5f447091479656b86da6762a103 x_refsource_MISC