CVE-2026-42468
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedBuffer 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.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceA buffer overflow vulnerability exists in OVMS3 version 3.3.005 within the canformat_pcap.cpp PCAP file parser. The parser fails to properly validate the phdr.len field from crafted PCAP input, allowing an attacker to overflow buffers and potentially achieve remote code execution or cause denial of service.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data= 3.3.005CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify OVMS3 firmware versionAccess the OVMS3 command line interface (via serial, SSH, or the OVMS mobile app) and run the command 'version' or check the Web UI dashboard for the firmware build informationAffected if The displayed firmware version is exactly 3.3.005
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Confirm PCAP parsing is enabledCheck the OVMS3 configuration for PCAP-related modules: Look for 'canformat pcap' or 'pcap' in the configuration via 'config list can' or check if the canformat_pcap module is loaded in the running systemAffected if The PCAP format decoder module is actively loaded or configured for use with any CAN interface
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Inspect for recent PCAP file processingCheck the OVMS3 file system for any stored or recently processed PCAP files in the /store or /sd directories that may have been ingested by the systemAffected if PCAP files exist in the system storage or have been recently processed by the canformat_pcap parser
You are affected if your OVMS3 firmware is exactly version 3.3.005 and the PCAP file parsing feature is actively used or has processed untrusted PCAP files.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataImplement proper bounds checking on the phdr.len field before using it to allocate or access buffers. Validate that the length value does not exceed expected maximums and matches the actual available data in the PCAP file.
- Consultation3.0 h
- Implementation4.0 h
- Testing8.0 h
- Review / QA3.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $4,896.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-42468 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-42468 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Version or environment caveats, and links to real fixes
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