🔐 CVE Alert

CVE-2026-81507

MEDIUM 6.5

ESF-IDF: Bluetooth Classic L2CAP Heap Memory Disclosure Allowing Unauthorized Access to Sensitive Data

CVSS Score
6.5
EPSS Score
0.0%
EPSS Percentile
0th

ESF-IDF is the Espressif Internet of Things (IOT) Development Framework. Prior to 5.2.8, 5.3.6, 5.5.5, 6.0.3, and 6.1-rc1, ESP-IDF BlueDroid L2CAP configuration-option processing in l2c_main.c and l2c_utils.c does not consistently validate option lengths against the remaining received packet bytes. A remote unauthenticated BR/EDR peer within radio range can send a malformed L2CAP configuration request that causes an out-of-bounds read, and under some runtime conditions limited adjacent Bluetooth stack memory can be included in an outbound L2CAP Configuration Response. The issue affects ESP32-class products using the BlueDroid host stack with Classic Bluetooth enabled. This issue is fixed in 5.2.8, 5.3.6, 5.5.5, 6.0.3, and 6.1-rc1.

CWE CWE-125
Vendor espressif
Product esp-idf
Published Oct 13, 2026
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CVSS v3 Breakdown

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

Affected Versions

espressif / esp-idf
< 5.2.8 >= 5.3-beta1, < 5.3.6 >= 5.4-beta1, < 5.5.5 >= 6.0-beta1, < 6.0.3 >= 6.1-beta1, < 6.1-rc1

References

NVD ↗ CVE.org ↗ EPSS Data ↗
github.com: https://github.com/espressif/esp-idf/security/advisories/GHSA-v335-fxwc-rc44 github.com: https://github.com/espressif/esp-idf/commit/14c99559b4337cabcf0f09c21d16b93c4cd7a6fe github.com: https://github.com/espressif/esp-idf/commit/1e07f6d83ca892630a7210df2958455f7ca77b4a github.com: https://github.com/espressif/esp-idf/commit/5731c63ece128f156939b9f734256e2227c1442a github.com: https://github.com/espressif/esp-idf/commit/8de265dc44b1b22c749ea44ee7c609b3da4162f0 github.com: https://github.com/espressif/esp-idf/commit/9a6d04f65e0e341e7d72bd417c9f31b8a04ce846 github.com: https://github.com/espressif/esp-idf/commit/c2610255a5adce651ca582bb82368c3dd0ee2834 github.com: https://github.com/espressif/esp-idf/commit/c8cd8f4f3019ae2f912c8cbe9974445e8d9b8749 github.com: https://github.com/espressif/esp-idf/releases/tag/v5.2.8 github.com: https://github.com/espressif/esp-idf/releases/tag/v5.3.6 github.com: https://github.com/espressif/esp-idf/releases/tag/v5.5.5 github.com: https://github.com/espressif/esp-idf/releases/tag/v6.0.3 github.com: https://github.com/espressif/esp-idf/releases/tag/v6.1-rc1