Heap Buffer Overflow in Espressif Internet of Things Development Framework
CVE-2026-45542

7.1HIGH

Key Information:

Vendor

Espressif

Status
Esp-idf
Vendor
CVE Published:
10 June 2026

What is CVE-2026-45542?

A heap buffer overflow vulnerability exists in the session-setup process of the Security Scheme 2 (SRP6a) component of the Espressif IoT Development Framework. The vulnerability arises from the first-phase handler failing to validate the length of a provided protobuf field for the SRP6a username, leading to potential heap corruption when excessively sized data is supplied. This issue affects versions 5.2.6, 5.3.5, 5.4.4, 5.5.4, and 6.0, and has been addressed in subsequent versions, ensuring improved application security.

Affected Version(s)

esp-idf = 5.2.6 = 5.2.6

esp-idf = 5.3.5 = 5.3.5

esp-idf = 5.4.4 = 5.4.4

References

https://github.com/espressif/esp-idf/security/advisories/...
x_refsource_CONFIRM
https://github.com/espressif/esp-idf/commit/0ea58d79845ad...
x_refsource_MISC
https://github.com/espressif/esp-idf/commit/56c3e385611e6...
x_refsource_MISC

CVSS V3.1

Score:
7.1
Severity:
HIGH
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Adjacent Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.