CVE-2026-42468
Published: 01 May 2026
Summary
CVE-2026-42468 is a high-severity Stack-based Buffer Overflow (CWE-121) vulnerability. Its CVSS base score is 8.8 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Client Execution (T1203); ranked at the 38.7th 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).
Threat & Defense at a Glance
Threat & Defense Details
Mitigating Controls (NIST 800-53 r5)AI
Directly remediates the buffer overflow flaw in the OVMS3 PCAP parser by requiring identification, testing, and deployment of patches for this specific vulnerability.
Mandates validation of information inputs like the phdr.len field in crafted PCAP files to prevent stack-based buffer overflows.
Implements memory safeguards such as non-executable stacks and address space randomization to mitigate arbitrary code execution from the buffer overflow exploit.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Stack-based buffer overflow in PCAP parser enables client-side code execution via crafted malicious file requiring user interaction to open/process.
NVD Description
Buffer overflow vulnerability in Open Vehicle Monitoring System 3 (OVMS3) 3.3.005. In canformat_pcap.cpp , the parser's phdr.len field is not properly validated, allowing remote attackers to cause a denial of service or possibly execute arbitrary code via crafted PCAP input.
Deeper analysisAI
CVE-2026-42468 is a buffer overflow vulnerability in Open Vehicle Monitoring System 3 (OVMS3) version 3.3.005. The flaw occurs in the canformat_pcap.cpp file, where the parser does not properly validate the phdr.len field. Published on 2026-05-01, it is classified under CWE-121 (Stack-based Buffer Overflow) and carries a CVSS v3.1 base score of 8.8 (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H).
Remote attackers without privileges can exploit the vulnerability by supplying crafted PCAP input, leading to a denial of service or potentially arbitrary code execution. The attack requires user interaction, such as opening or processing the malicious PCAP file within the affected OVMS3 environment.
Mitigation details are available in the referenced advisory at https://gist.github.com/sgInnora/f4ac66faeefe07a653ceeb3f58cdc381.
Details
- CWE(s)