{"id":"CVE-2026-81507","revision":"4df30800397940168328ffbbad2fc672","records":[{"revision":"4df30800397940168328ffbbad2fc672","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-81507","aliases":[],"title":"ESF-IDF: Bluetooth Classic L2CAP Heap Memory Disclosure Allowing Unauthorized Access to Sensitive Data","description":"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.","state":0,"publishedAt":"2026-10-13T15:12:01.01+00:00","modifiedAt":"2026-10-14T15:00:34.785+00:00","affected":[{"ecosystem":"Vendor product","name":"esp-idf","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"espressif\",\n                    \"product\": \"esp-idf\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 5.2.8\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 5.3-beta1, < 5.3.6\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 5.4-beta1, < 5.5.5\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 6.0-beta1, < 6.0.3\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 6.1-beta1, < 6.1-rc1\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","score":6.5,"severity":"MEDIUM"}],"references":["https://github.com/espressif/esp-idf/security/advisories/GHSA-v335-fxwc-rc44","https://github.com/espressif/esp-idf/commit/14c99559b4337cabcf0f09c21d16b93c4cd7a6fe","https://github.com/espressif/esp-idf/commit/1e07f6d83ca892630a7210df2958455f7ca77b4a","https://github.com/espressif/esp-idf/commit/5731c63ece128f156939b9f734256e2227c1442a","https://github.com/espressif/esp-idf/commit/8de265dc44b1b22c749ea44ee7c609b3da4162f0","https://github.com/espressif/esp-idf/commit/9a6d04f65e0e341e7d72bd417c9f31b8a04ce846","https://github.com/espressif/esp-idf/commit/c2610255a5adce651ca582bb82368c3dd0ee2834","https://github.com/espressif/esp-idf/commit/c8cd8f4f3019ae2f912c8cbe9974445e8d9b8749","https://github.com/espressif/esp-idf/releases/tag/v5.2.8","https://github.com/espressif/esp-idf/releases/tag/v5.3.6","https://github.com/espressif/esp-idf/releases/tag/v5.5.5","https://github.com/espressif/esp-idf/releases/tag/v6.0.3","https://github.com/espressif/esp-idf/releases/tag/v6.1-rc1"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-81507","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-81507","identifiers":["CVE-2026-81507"]},"retained":false,"historicalAffected":[]}],"coverage":[]}