CVE-2026-45542: Espressif Esp-Idf

High severity, CVSS 7.1. EPSS: 0.5% chance of exploitation in the next 30 days.

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

• Espressif Esp-Idf: version 5.2.6 only; version 5.3.5 only; version 5.4.4 only; version 5.5.4 only; version 6.0 only

Published 2026-06-10. Last modified 2026-07-23.