RT-Labs AB C-Open CANopen SDO Server Write Protection Bypass
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.
CVE-2026-82358
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-82358
C-Open
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "RT-Labs AB",
"product": "C-Open",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "1.1.1",
"versionType": "custom"
},
{
"status": "unaffected",
"version": "1.1.1"
}
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-82358
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #11949 · Revision 1
- Added to Heist Feed
- Publisher date