CVE-2026-45542 espressif CVE debrief

Who should care

Users of Espressif Internet of Things (IOT) Development Framework (ESF-IDF) versions 5.2.6, 5.3.5, 5.4.4, 5.5.4, and 6.0 should be aware of this vulnerability.

Technical summary

The vulnerability is caused by improper handling of client-supplied data in the protocomm component's Security Scheme 2 (SRP6a) session-setup path. Specifically, the first-phase handler (handle_session_command0() in components/protocomm/src/security/security2.c) does not properly validate the length of the client-supplied protobuf field for the SRP6a username, leading to a heap buffer overflow.

Defensive priority

HIGH

Recommended defensive actions

• Upgrade to a patched version of Espressif Internet of Things (IOT) Development Framework (ESF-IDF): 5.2.7, 5.3.6, 5.4.5, 5.5.5, or 6.0.1.

Evidence notes

The vulnerability was patched in versions 5.2.7, 5.3.6, 5.4.5, 5.5.5, and 6.0.1. For more information, see [ref-4](https://github.com/espressif/esp-idf/commit/0ea58d79845ad674d0358d5de246015a68c4cb4f), [ref-5](https://github.com/espressif/esp-idf/commit/56c3e385611e63162d0f2f8504ac4ae2ccfccef0), [ref-6](https://github.com/espressif/esp-idf/commit/71eb2dbe6aaef830719ecac8edf409e2992b64b2), [ref-7](https://github.com/espressif/esp-idf/commit/9b4cacf9cbc69379972de6a2247fcf5af9240961), [ref-8](https://github.com/espressif/esp-idf/commit/a2f4554f10ba075c98cbc67464db096ba32497cf), [ref-9](https://github.com/espressif/esp-idf/commit/f5d24a7e919bc5f447091479656b86da6762a103), and [ref-10](https://github.com/espressif/esp-idf/security/advisories/GHSA-9r76-858f-v6jh).

Official resources