CVE-2026-42468:

A buffer overflow vulnerability in Open Vehicle Monitoring System 3 (OVMS3) version 3.3.005 allows remote attackers to cause denial of service or execute arbitrary code through improper validation of the `phdr.len` field in `canformat_pcap.cpp`.

Score
A numerical rating that indicates how dangerous this vulnerability is.

8.8High

Published Date:May 1, 2026
CISA KEV Date:*No Data*
Industries Affected:20

Threat Predictions

EPSS Score:0.1
EPSS Percentile:31%

Exploitability

Score:2.8
Attack Vector:NETWORK
Attack Complexity:LOW
Privileges Required:NONE
User Interaction:REQUIRED
Scope:UNCHANGED

Impact

Score:5.9
Confidentiality Impact:HIGH
Integrity Impact:HIGH
Availability Impact:HIGH

Description Preview

Overview

CVE-2026-42468 affects Open Vehicle Monitoring System 3 (OVMS3) version 3.3.005, a widely used open-source vehicle telemetry and monitoring platform. The vulnerability arises from insufficient validation of the `phdr.len` field within the PCAP format parsing logic in `canformat_pcap.cpp`. Because no upper-bound check is enforced on this field, a remote attacker can craft malicious PCAP data that triggers a stack-based buffer overflow. This can destabilize the system through denial of service or potentially enable arbitrary code execution, posing a significant risk to vehicle monitoring infrastructure that processes untrusted or externally sourced PCAP data.

Remediation

Users and administrators running OVMS3 version 3.3.005 should apply the following remediation steps. First, monitor the official OVMS3 GitHub repository for a patched release and upgrade as soon as one becomes available. Until a patch is applied, restrict access to any interfaces or services that accept PCAP input, ensuring only trusted sources can supply such data. Implement network-level controls such as firewalls or access control lists to limit exposure of the affected service to untrusted networks. Avoid processing PCAP files from unknown or unverified sources on vulnerable systems. Additionally, consider deploying runtime protections such as address space layout randomization (ASLR) and stack canaries where supported to reduce the risk of successful exploitation.