Out-of-bounds read in ESP-IDF - CVE-2026-81507
Published: September 7, 2026
Vulnerability identifier: #VU147294
CSH Severity: Medium
CVSS v4: 7.1 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-81507
CWE-ID: CWE-125
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to an out-of-bounds read in BlueDroid L2CAP configuration-option processing in l2c_main.c and l2c_utils.c when processing a malformed L2CAP configuration request. A remote attacker can send a malformed L2CAP configuration request to disclose sensitive information.
Exploitation occurs during L2CAP channel configuration without authentication or encryption.
Affected software
ESP-IDF
How to mitigate CVE-2026-81507
Install security update from vendor's website.
ESP-IDF - addressed in versions 5.5.5, 6.0.2