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

Quick assessment

Affected
RT-Labs AB C-Open
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

RT-Labs AB C-Open CANopen 的 SDO（服务数据对象）服务器实现（位于 中）存在一个写保护绕过漏洞。该实现在处理下载分段帧（download-segment frames）时，未能正确验证写入权限。 攻击者若位于 CAN 总线上且无需身份认证，可先发起对一个只读对象字典（Object Dictionary, OD）条目的 SDO 上传请求，从而将数据指针指向该只读对象；随后发送下载分段帧，向该内存位置写入数据。由于下载分段处理程序未验证是否存在活跃的下载会话，任何 CANopen 节点均可通

CVSS 6.5 · Medium EPSS 0.24% · P13

Affected Version Matrix 2

VendorProduct Version RangeStatus
RT-Labs AB C-Open < 1.1.1 affected
1.1.1 unaffected
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I. Basic Information for CVE-2026-82358

Vulnerability Information
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Vulnerability Title
RT-Labs AB C-Open CANopen SDO Server Write Protection Bypass
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
RT-Labs AB C-Open 0 ~ 1.1.1 -

II. Public POCs for CVE-2026-82358

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III. Intelligence Information for CVE-2026-82358

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Vendor Pages for CVE-2026-82358 (1)

Other References for CVE-2026-82358 (1)

Other References for CVE-2026-82358 (2)

IV. Related Vulnerabilities

Same product: C-Open
Same vendor: RT-Labs AB
Same weakness: CWE-863

V. Comments for CVE-2026-82358

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