{"id":"CVE-2026-45542","summary":"ESF-IDF: Heap buffer overflow in protocomm Security2 over Bluetooth","details":"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.","aliases":["GHSA-9r76-858f-v6jh"],"modified":"2026-07-08T08:09:38.437389567Z","published":"2026-06-10T00:34:53.238Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45542.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-122"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45542.json"},{"type":"ADVISORY","url":"https://github.com/espressif/esp-idf/security/advisories/GHSA-9r76-858f-v6jh"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45542"},{"type":"FIX","url":"https://github.com/espressif/esp-idf/commit/0ea58d79845ad674d0358d5de246015a68c4cb4f"},{"type":"FIX","url":"https://github.com/espressif/esp-idf/commit/56c3e385611e63162d0f2f8504ac4ae2ccfccef0"},{"type":"FIX","url":"https://github.com/espressif/esp-idf/commit/71eb2dbe6aaef830719ecac8edf409e2992b64b2"},{"type":"FIX","url":"https://github.com/espressif/esp-idf/commit/9b4cacf9cbc69379972de6a2247fcf5af9240961"},{"type":"FIX","url":"https://github.com/espressif/esp-idf/commit/a2f4554f10ba075c98cbc67464db096ba32497cf"},{"type":"FIX","url":"https://github.com/espressif/esp-idf/commit/f5d24a7e919bc5f447091479656b86da6762a103"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/espressif/esp-idf","events":[{"introduced":"9ef24e3e2a2c96e720d83c574a3f8699177573da"},{"fixed":"0ea58d79845ad674d0358d5de246015a68c4cb4f"},{"fixed":"56c3e385611e63162d0f2f8504ac4ae2ccfccef0"},{"fixed":"71eb2dbe6aaef830719ecac8edf409e2992b64b2"},{"fixed":"9b4cacf9cbc69379972de6a2247fcf5af9240961"},{"fixed":"a2f4554f10ba075c98cbc67464db096ba32497cf"},{"fixed":"f5d24a7e919bc5f447091479656b86da6762a103"}],"database_specific":{"cpe":["cpe:2.3:a:espressif:esp-idf:5.2.6:*:*:*:*:*:*:*","cpe:2.3:a:espressif:esp-idf:5.3.5:*:*:*:*:*:*:*","cpe:2.3:a:espressif:esp-idf:5.4.4:*:*:*:*:*:*:*","cpe:2.3:a:espressif:esp-idf:5.5.4:*:*:*:*:*:*:*","cpe:2.3:a:espressif:esp-idf:6.0:*:*:*:*:*:*:*"],"extracted_events":[{"introduced":"5.2.6"},{"last_affected":"5.2.6"},{"introduced":"5.3.5"},{"last_affected":"5.3.5"},{"introduced":"5.4.4"},{"last_affected":"5.4.4"},{"introduced":"5.5.4"},{"last_affected":"5.5.4"},{"introduced":"6.0"},{"last_affected":"6.0"}],"source":["CPE_STRING","REFERENCES"]}}],"versions":["5.2.6","5.3.5","5.4.4","5.5.4","6.0","= 5.2.6","= 5.3.5","= 5.4.4","= 5.5.4","= 6.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-45542.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H"}]}