{"id":"CVE-2026-82358","title":"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","summary":"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 unaut…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","cwe":["CWE-863"],"vendor":"RT-Labs AB","product":"C-Open","affected":["C-Open < 1.1.1"],"published":"2026-10-01","updated":"2026-10-01","sourceUpdated":"2026-10-01T20:34:45.250","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-82358","references":[{"url":"https://github.com/rtlabs-com/c-open/releases/tag/public%2Fv1.1.1","label":"9119a7d8-5eab-497f-8521-727c672e3725"},{"url":"https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2025/va-26-275-02.json","label":"9119a7d8-5eab-497f-8521-727c672e3725"},{"url":"https://rt-labs.com/wp-content/uploads/2026/09/RRTL-260929-01.pdf","label":"9119a7d8-5eab-497f-8521-727c672e3725"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-82358","label":"9119a7d8-5eab-497f-8521-727c672e3725"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-10-01T19:58:57.563Z","slug":"CVE-2026-82358","body":"## Overview\n\nRT-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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}