Medium 6.5Published Oct 1, 2026

CVE-2026-82358RT-Labs AB C-Open CANopen SDO Server Write Protection Bypass

Updated under an hour ago (2026-10-19 09:50 UTC)

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Every CVE for RT-Labs AB C-Open

Exploited in the last 30 days

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.

CVSS: 6.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Weakness (CWE): CWE-863
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: cisa-cg
NVD analysis: Deferred
Record last updated: Oct 7, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

RT-Labs AB C-Open rt_labs:c_open (from the name)	before 1.1.1; 1.1.1 not affected	CNA record

References

https://rt-labs.com/wp-content/uploads/2026/09/RRTL-260929-01.pdfvendor-advisory
https://github.com/rtlabs-com/c-open/releases/tag/public%2Fv1.1.1release-notes
https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2025/va-26-275-02.jsonthird-party-advisory
https://www.cve.org/CVERecord?id=CVE-2026-82358vdb-entry

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.