Vulnerability in Canboat
CVE-2026-56790
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:H.
EPSS exploit prediction
EPSS: 0.003 (21.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 21st percentile — 21.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Canboat — versions 0, a5a22b74b9ac5688019cba62669df08562cebd6f
Weakness classification (CWE)
References
- github.com/canboat/canboat/issues/644 (technical-description, exploit)
- github.com/canboat/canboat/pull/649 (issue-tracking)
- github.com/canboat/canboat/commit/a5a22b74b9ac5688019cba62669df08562cebd6f (patch)
- www.vulncheck.com/advisories/canboat-off-by-one-global-buffer-overflow-in-searc… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-56790?
- CVE-2026-56790 is a high-severity vulnerability in Canboat, classified under Off-by-one Error. CVSS score: 7.3/10. Published 2026-06-25.
- How severe is CVE-2026-56790?
- High severity. CVSS v3 base score is 7.3 out of 10.