{"id":"CVE-2026-82358","state":"PUBLISHED","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.","publishedAt":"2026-10-01T19:42:16.559Z","updatedAt":"2026-10-07T15:52:15.539Z","severity":{"score":7.1,"label":"High","version":"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","source":"cisa-cg"},"assigner":"cisa-cg","products":["RT-Labs AB C-Open"],"affected":[{"vendor":"RT-Labs AB","product":"C-Open","defaultStatus":"affected","versions":[{"version":"0","status":"affected","lessThan":"1.1.1","versionType":"custom"},{"version":"1.1.1","status":"unaffected"}]}],"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"],"weaknesses":["CWE-863"],"ingestedAt":"2026-10-29T20:13:15.269Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/82xxx/CVE-2026-82358.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-82358","state":"PUBLISHED","datePublished":"2026-10-01T19:42:16.559Z","dateUpdated":"2026-10-07T15:52:15.539Z","assignerShortName":"cisa-cg","assignerOrgId":"9119a7d8-5eab-497f-8521-727c672e3725","dateReserved":"2026-08-28T18:10:39.170Z"},"containers":{"cna":{"title":"RT-Labs AB C-Open CANopen SDO Server Write Protection Bypass","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"RT-Labs AB","product":"C-Open","defaultStatus":"affected","versions":[{"version":"0","status":"affected","lessThan":"1.1.1","versionType":"custom"},{"version":"1.1.1","status":"unaffected"}]}],"references":[{"url":"https://rt-labs.com/wp-content/uploads/2026/09/RRTL-260929-01.pdf","name":"url","tags":["vendor-advisory"]},{"url":"https://github.com/rtlabs-com/c-open/releases/tag/public%2Fv1.1.1","name":"url","tags":["release-notes"]},{"url":"https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2025/va-26-275-02.json","name":"url","tags":["third-party-advisory"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-82358","name":"url","tags":["vdb-entry"]}],"metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":6.5,"attackVector":"ADJACENT_NETWORK","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","integrityImpact":"HIGH","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"NONE","privilegesRequired":"NONE","confidentialityImpact":"NONE"}},{"cvssV4_0":{"version":"4.0","baseScore":7.1,"attackVector":"ADJACENT","baseSeverity":"HIGH","vectorString":"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","userInteraction":"NONE","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","subIntegrityImpact":"NONE","vulnIntegrityImpact":"HIGH","subAvailabilityImpact":"NONE","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","vulnConfidentialityImpact":"NONE"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-08-28T18:03:52.879928Z","id":"CVE-2026-82358","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-863","description":"CWE-863 Incorrect Authorization","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"cisa-cg","orgId":"9119a7d8-5eab-497f-8521-727c672e3725","dateUpdated":"2026-10-01T19:42:16.559Z"},"credits":[{"value":"f0rw4rd, quellsec.dev","lang":"en"}],"datePublic":"2026-09-21T00:00:00.000Z"},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-82358","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2026-10-07T15:10:49.474411Z"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-07T15:52:15.539Z"}}]}}}