{"id":"CVE-2026-102692","revision":"b6dbd22e0f6f4f74ab03e48541ea2e6d","records":[{"revision":"b6dbd22e0f6f4f74ab03e48541ea2e6d","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-102692","aliases":[],"title":"RIOT: Potential integer overflow in nanocoap Block2 handling leading to out-of-bounds memory access","description":"RIOT is an open-source microcontroller operating system designed for Internet of Things devices and other embedded systems. Prior to 2026.07, nanocoap accepts oversized CoAP Block2 option values without enforcing the 20-bit maximum block number, allowing block offset multiplication to overflow on 32-bit targets. The affected master baseline is commit aeeae69e; the verified fix is later on master and remains unreleased. The oversized value passes from coap_get_blockopt() to coap_block_slicer_init(). A remote CoAP client can send a malformed Block2 option that produces an invalid slice range and can cause out-of-bounds memory access, denial of service, or memory corruption. This vulnerability is fixed in 2026.07.","state":0,"publishedAt":"2026-10-16T16:48:35.776+00:00","modifiedAt":"2026-10-16T21:20:02.887+00:00","affected":[{"ecosystem":"Vendor product","name":"RIOT","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"RIOT-OS\",\n                    \"product\": \"RIOT\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 2026.07\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","score":9.1,"severity":"CRITICAL"}],"references":["https://github.com/RIOT-OS/RIOT/security/advisories/GHSA-8365-gj33-rgpf","https://github.com/RIOT-OS/RIOT/commit/6b283ace3565d931b3edff7e115d4f79339253b8","https://github.com/RIOT-OS/RIOT/commit/ee1fa0ef91874494823d476392572aeefdbc6b74","https://github.com/RIOT-OS/RIOT/releases/tag/2026.07"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-102692","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-102692","identifiers":["CVE-2026-102692"]},"retained":false,"historicalAffected":[]}],"coverage":[]}