{"schema":"threatline.record/2","record":{"id":"CVE-2026-81507","aliases":["GHSA-v335-fxwc-rc44"],"summary":"ESF-IDF: Bluetooth Classic L2CAP Heap Memory Disclosure Allowing Unauthorized Access to Sensitive Data","details":"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.","categories":["Unclassified"],"product":"esp-idf","vendor":"espressif","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-81507","source_modified_at":"2026-10-14T15:00:34.785Z","fetched_at":"2026-10-23T18:48:36.087640Z","product":"esp-idf","vendor":"espressif","versions":[{"version":"< 5.2.8","status":"affected"},{"version":">= 5.3-beta1, < 5.3.6","status":"affected"},{"version":">= 5.4-beta1, < 5.5.5","status":"affected"},{"version":">= 6.0-beta1, < 6.0.3","status":"affected"},{"version":">= 6.1-beta1, < 6.1-rc1","status":"affected"}],"defaultStatus":null}],"fixed_versions":[],"cvss":6.5,"severity":"Medium","kev":{"listed":false},"epss":{"probability":0.00264,"percentile":0.17374,"score_date":"2026-10-23"},"published_at":"2026-10-13T15:12:01.010Z","modified_at":"2026-10-14T15:00:34.785Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-81507","fetched_at":"2026-10-23T18:48:36.087640Z","source_modified_at":"2026-10-14T15:00:34.785Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-81507","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/espressif/esp-idf/security/advisories/GHSA-v335-fxwc-rc44","tags":["x_refsource_CONFIRM"]},{"source":"CVE List","url":"https://github.com/espressif/esp-idf/commit/14c99559b4337cabcf0f09c21d16b93c4cd7a6fe","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/espressif/esp-idf/commit/1e07f6d83ca892630a7210df2958455f7ca77b4a","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/espressif/esp-idf/commit/5731c63ece128f156939b9f734256e2227c1442a","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/espressif/esp-idf/commit/8de265dc44b1b22c749ea44ee7c609b3da4162f0","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/espressif/esp-idf/commit/9a6d04f65e0e341e7d72bd417c9f31b8a04ce846","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/espressif/esp-idf/commit/c2610255a5adce651ca582bb82368c3dd0ee2834","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/espressif/esp-idf/commit/c8cd8f4f3019ae2f912c8cbe9974445e8d9b8749","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/espressif/esp-idf/releases/tag/v5.2.8","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/espressif/esp-idf/releases/tag/v5.3.6","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/espressif/esp-idf/releases/tag/v5.5.5","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/espressif/esp-idf/releases/tag/v6.0.3","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/espressif/esp-idf/releases/tag/v6.1-rc1","tags":["x_refsource_MISC"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"none","automatable":"no","technical_impact":"partial","assessed_at":"2026-10-14T15:00:21.832346Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-14T15:00:34.785Z","content_hash":"94e741411aaee2d797cefe160a4ece59902344a683c6fd0d21e681ce81f521b7"}}