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CVE-2026-56790

7.3 · HIGH

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.

Published Jun 25, 2026CWE-193EPSS 0.31%

Overview

CVE-2026-56790 is a high-severity vulnerability. It was published on June 25, 2026 and has a CVSS 3.1 base score of 7.3 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.3, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/canboat/canboat/commit/a5a22b74b9ac5688019cba62669df08562cebd6fGitHubgithub.com/canboat/canboat/issues/644GitHubgithub.com/canboat/canboat/pull/649Refwww.vulncheck.com/advisories/canboat-off-by-one-global-buffer-overflow-in-searchforpgn

How CyberStrike helps

Frequently asked questions

What is CVE-2026-56790?

CVE-2026-56790 is a high-severity vulnerability. It was published on June 25, 2026 and has a CVSS 3.1 base score of 7.3 (HIGH).

How severe is CVE-2026-56790?

This vulnerability has a CVSS 3.1 base score of 7.3, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-56790?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-56790?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-56790 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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