CVE-2026-82358
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
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 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 Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| RT-Labs AB | C-Open | 0 < 1.1.1 | affected |
| RT-Labs AB | C-Open | 1.1.1 | unaffected |
Weaknesses
- CWE-863: CWE-863 Incorrect Authorization
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
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