{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-45542: ESF-IDF: Heap buffer overflow in protocomm Security2 over Bluetooth","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-45542","status":"final","version":"1","initial_release_date":"2026-06-10T00:34:53.238Z","current_release_date":"2026-06-10T15:16:16.137Z","revision_history":[{"date":"2026-06-10T00:34:53.238Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"ESF-IDF is the Espressif Internet of Things (IOT) Development Framework. In versions 5.2.6, 5.3.5, 5.4.4, 5.5.4, and 6.0, a heap buffer overflow exists in the Security Scheme 2 (SRP6a) session-setup path of the protocomm component. The first-phase handler (handle_session_command0() in components/protocomm/src/security/security2.c) trusts the length of a client-supplied protobuf field for the SRP6a username and copies it into a buffer whose size is derived from a narrower destination type. The resulting truncation-versus-copy asymmetry corrupts the heap when an oversized value is supplied. This issue has been patched in versions 5.2.7, 5.3.6, 5.4.5, 5.5.5, and 6.0.1.","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-45542 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-45542"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-45542"},{"category":"external","summary":"https://github.com/espressif/esp-idf/security/advisories/GHSA-9r76-858f-v6jh","url":"https://github.com/espressif/esp-idf/security/advisories/GHSA-9r76-858f-v6jh"},{"category":"external","summary":"https://github.com/espressif/esp-idf/commit/0ea58d79845ad674d0358d5de246015a68c4cb4f","url":"https://github.com/espressif/esp-idf/commit/0ea58d79845ad674d0358d5de246015a68c4cb4f"},{"category":"external","summary":"https://github.com/espressif/esp-idf/commit/56c3e385611e63162d0f2f8504ac4ae2ccfccef0","url":"https://github.com/espressif/esp-idf/commit/56c3e385611e63162d0f2f8504ac4ae2ccfccef0"},{"category":"external","summary":"https://github.com/espressif/esp-idf/commit/71eb2dbe6aaef830719ecac8edf409e2992b64b2","url":"https://github.com/espressif/esp-idf/commit/71eb2dbe6aaef830719ecac8edf409e2992b64b2"},{"category":"external","summary":"https://github.com/espressif/esp-idf/commit/9b4cacf9cbc69379972de6a2247fcf5af9240961","url":"https://github.com/espressif/esp-idf/commit/9b4cacf9cbc69379972de6a2247fcf5af9240961"},{"category":"external","summary":"https://github.com/espressif/esp-idf/commit/a2f4554f10ba075c98cbc67464db096ba32497cf","url":"https://github.com/espressif/esp-idf/commit/a2f4554f10ba075c98cbc67464db096ba32497cf"},{"category":"external","summary":"https://github.com/espressif/esp-idf/commit/f5d24a7e919bc5f447091479656b86da6762a103","url":"https://github.com/espressif/esp-idf/commit/f5d24a7e919bc5f447091479656b86da6762a103"}]},"product_tree":{"branches":[{"category":"vendor","name":"espressif","branches":[{"category":"product_name","name":"esp-idf","branches":[{"category":"product_version","name":"= 5.2.6","product":{"name":"espressif esp-idf = 5.2.6","product_id":"CSAFPID-1","product_identification_helper":{"cpe":"cpe:2.3:a:espressif:esp-idf:*:*:*:*:*:*:*:*"}}},{"category":"product_version","name":"= 5.3.5","product":{"name":"espressif esp-idf = 5.3.5","product_id":"CSAFPID-2","product_identification_helper":{"cpe":"cpe:2.3:a:espressif:esp-idf:*:*:*:*:*:*:*:*"}}},{"category":"product_version","name":"= 5.4.4","product":{"name":"espressif esp-idf = 5.4.4","product_id":"CSAFPID-3","product_identification_helper":{"cpe":"cpe:2.3:a:espressif:esp-idf:*:*:*:*:*:*:*:*"}}},{"category":"product_version","name":"= 5.5.4","product":{"name":"espressif esp-idf = 5.5.4","product_id":"CSAFPID-4","product_identification_helper":{"cpe":"cpe:2.3:a:espressif:esp-idf:*:*:*:*:*:*:*:*"}}},{"category":"product_version","name":"= 6.0","product":{"name":"espressif esp-idf = 6.0","product_id":"CSAFPID-5","product_identification_helper":{"cpe":"cpe:2.3:a:espressif:esp-idf:*:*:*:*:*:*:*:*"}}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-45542","title":"ESF-IDF: Heap buffer overflow in protocomm Security2 over Bluetooth","notes":[{"category":"description","text":"ESF-IDF is the Espressif Internet of Things (IOT) Development Framework. In versions 5.2.6, 5.3.5, 5.4.4, 5.5.4, and 6.0, a heap buffer overflow exists in the Security Scheme 2 (SRP6a) session-setup path of the protocomm component. The first-phase handler (handle_session_command0() in components/protocomm/src/security/security2.c) trusts the length of a client-supplied protobuf field for the SRP6a username and copies it into a buffer whose size is derived from a narrower destination type. The resulting truncation-versus-copy asymmetry corrupts the heap when an oversized value is supplied. This issue has been patched in versions 5.2.7, 5.3.6, 5.4.5, 5.5.5, and 6.0.1.","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1","CSAFPID-2","CSAFPID-3","CSAFPID-4","CSAFPID-5"]},"scores":[{"cvss_v3":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","baseScore":7.1,"baseSeverity":"HIGH"},"products":["CSAFPID-1","CSAFPID-2","CSAFPID-3","CSAFPID-4","CSAFPID-5"]}],"remediations":[{"category":"none_available","details":"No fixed version is published yet. Monitor the upstream advisory.","product_ids":["CSAFPID-1","CSAFPID-2","CSAFPID-3","CSAFPID-4","CSAFPID-5"]}]}]}