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PatchSiren cyber security CVE debrief

CVE-2026-42468 Openvehicles CVE debrief

CVE-2026-42468 is a high-severity buffer overflow in Open Vehicle Monitoring System 3 (OVMS3) 3.3.005 affecting PCAP parsing in canformat_pcap.cpp. According to the CVE/NVD record, a crafted PCAP input can trigger the flaw and may cause denial of service or possibly arbitrary code execution. NVD marks the issue as analyzed and lists the affected firmware version as 3.3.005.

Vendor
Openvehicles
Product
Open Vehicle Monitoring System 3
CVSS
HIGH 8.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-05-01
Original CVE updated
2026-05-20
Advisory published
2026-05-01
Advisory updated
2026-05-20

Who should care

Administrators, developers, and operators using OVMS3 3.3.005 should care, especially if their workflows accept or import PCAP files from untrusted or externally supplied sources.

Technical summary

The vulnerability is described as a buffer overflow in canformat_pcap.cpp where the parser's phdr.len field is not properly validated. NVD maps the weakness to CWE-121 and assigns CVSS 3.1 vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H, indicating network reachability, low attack complexity, no privileges required, and user interaction required. The record lists openvehicles firmware 3.3.005 as vulnerable.

Defensive priority

High. The combination of network reachability, no privileges, and potential impact to confidentiality, integrity, and availability makes this urgent to address in any environment that processes untrusted PCAP input, even though user interaction is required.

Recommended defensive actions

  • Inventory OVMS3 3.3.005 deployments and identify any features, workflows, or integrations that ingest PCAP files.
  • Apply the vendor or upstream fix as soon as it is available; until then, restrict or disable PCAP processing from untrusted sources.
  • Treat PCAP files as untrusted input and isolate processing in a constrained environment, such as a sandbox or dedicated analysis system.
  • Track the linked upstream issue and official CVE/NVD records for remediation updates and version guidance.

Evidence notes

This debrief is based on the official CVE record and NVD entry for CVE-2026-42468, which was published on 2026-05-01T17:16:25.150Z and last modified on 2026-05-20T15:19:34.470Z. The NVD record is marked "Analyzed" and identifies the vulnerable CPE for openvehicles firmware 3.3.005. The CVE description states that the parser's phdr.len field is not properly validated in canformat_pcap.cpp, and NVD maps the issue to CWE-121 with CVSS 3.1 vector AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. MITRE-listed references include a third-party advisory and an upstream issue tracker entry.

Official resources

Publicly disclosed in the official CVE/NVD record on 2026-05-01T17:16:25.150Z; the record was last modified on 2026-05-20T15:19:34.470Z.