CVE-2026-42469
Published: 01 May 2026
Summary
CVE-2026-42469 is a high-severity Stack-based Buffer Overflow (CWE-121) vulnerability in Openvehicles Open Vehicle Monitoring System Firmware. Its CVSS base score is 8.6 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 27.6th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-2 (Flaw Remediation).
Deeper analysis
CVE-2026-42469 is a buffer overflow vulnerability (CWE-121) in Open Vehicle Monitoring System 3 (OVMS3) version 3.3.005. The flaw occurs in the canformat_canswitch.cpp component, where the parser does not properly validate the CANswitch DLC value, published on 2026-05-01.
The vulnerability has a CVSS v3.1 base score of 8.6 (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H). Remote attackers require no privileges or user interaction and can exploit it over the network by sending crafted CANswitch frames, potentially causing a denial of service or executing arbitrary code.
Mitigation details are available in the referenced advisory at https://gist.github.com/sgInnora/f4ac66faeefe07a653ceeb3f58cdc381.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-26697
Vulnerability details
Buffer overflow vulnerability in Open Vehicle Monitoring System 3 (OVMS3) 3.3.005. In canformat_canswitch.cpp the parser does not properly validate a CANswitch DLC value, allowing remote attackers to cause a denial of service or possibly execute arbitrary code via crafted CANswitch…
more
frames.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Remote unauthenticated network exploitation of buffer overflow in OVMS3 parser for arbitrary code execution or DoS directly matches T1190 Exploit Public-Facing Application.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Enforces validation of CANswitch DLC values in the parser to directly prevent buffer overflows from crafted frames.
Requires timely remediation of the specific buffer overflow flaw in canformat_canswitch.cpp through patching or updates.
Implements memory protections like DEP and ASLR to mitigate exploitation of buffer overflows even if validation fails.