{"id":"CVE-2026-82358","revision":null,"records":[{"revision":"8e26a5038f164222a08db21cf2233c91","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-82358","aliases":[],"title":"RT-Labs AB C-Open CANopen SDO Server Write Protection Bypass","description":"RT-Labs AB C-Open CANopen contains a write protection bypass in the SDO (Service Data Object) server implementation 'src/co_sdo_server.c' that fails to properly validate write permissions when processing download-segment frames. An unauthenticated attacker on the CAN bus can initiate an SDO upload for a read-only Object Dictionary (OD) entry, which sets a data pointer to the read-only object, then send download-segment frames to write to that memory location. The download-segment handler does not verify that a download session is active, allowing any CANopen node to overwrite read-only OD entries using two SDO frames. Note that CANopen protocol operates over CAN bus and does not provide built-in authentication mechanisms. Fixed in 1.1.1.","state":0,"publishedAt":"2026-10-01T19:42:16.559+00:00","modifiedAt":"2026-10-07T15:52:15.539+00:00","affected":[{"ecosystem":"Vendor product","name":"C-Open","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"RT-Labs AB\",\n                    \"product\": \"C-Open\",\n                    \"defaultStatus\": \"affected\",\n                    \"versions\": [\n                        {\n                            \"version\": \"0\",\n                            \"status\": \"affected\",\n                            \"lessThan\": \"1.1.1\",\n                            \"versionType\": \"custom\"\n                        },\n                        {\n                            \"version\": \"1.1.1\",\n                            \"status\": \"unaffected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","score":6.5,"severity":"MEDIUM"},{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N","score":7.1,"severity":"HIGH"}],"references":["https://rt-labs.com/wp-content/uploads/2026/09/RRTL-260929-01.pdf","https://github.com/rtlabs-com/c-open/releases/tag/public%2Fv1.1.1","https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2025/va-26-275-02.json","https://www.cve.org/CVERecord?id=CVE-2026-82358"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-82358","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-82358","identifiers":["CVE-2026-82358"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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