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CVE-2026-56790 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

Description

CANBoat through 6.22, fixed in commit a5a22b7, contains an off-by-one global buffer overflow in the searchForPgn() function in analyzer/pgn.c that allows remote attackers to crash the application. Attackers can deliver a crafted NMEA-2000 message with an out-of-range PGN value over CAN bus or N2K-over-IP to trigger an out-of-bounds array access and denial of service.

Metrics

CVSS 3.x Severity and Vector Strings:

VolerionCVSS-B:6.5 MEDIUMVector:CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CNA: [email protected]CVSS-B:7.3 HIGHVector:CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/canboat/canboat/commit/a5a22b74b9ac5688019cba62669df08562cebd6f	[email protected]	Source CodeVendor
https://github.com/canboat/canboat/issues/644	[email protected]	ExploitIssue TrackingTechnical AnalysisVendor
https://github.com/canboat/canboat/pull/649	[email protected]	Source CodeVendor
https://www.vulncheck.com/advisories/canboat-off-by-one-global-buffer-overflow-in-searchforpgn	[email protected]	AdvisoryBundle

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-193	Off-by-one Error	[email protected]

Affected Products

Product	Versions
CANBoat	<= 6.22
CPE No CPEs found in CPE dictionary for this product. Remediation Upgrade: 6.3.0moderate effort

Change History

3 change records found show changes

Date	Action	Recorded By
Jul 14, 2026	CVE Modified	[email protected]
Jun 26, 2026	CVE Modified	CISA-ADP
Jun 25, 2026	New CVE Received	[email protected]