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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.

PUBLISHED Reserved 2026-06-23 | Published 2026-06-25 | Updated 2026-06-25 | Assigner VulnCheck




HIGH: 7.0CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N

HIGH: 7.3CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:H

Problem types

Off-by-one Error

Product status

Default status
unaffected

Any version
affected

a5a22b74b9ac5688019cba62669df08562cebd6f (git)
unaffected

Credits

FuzzingLabs finder

References

github.com/canboat/canboat/issues/644 (Researcher Disclosure) technical-description exploit

github.com/canboat/canboat/pull/649 (Pull Request) issue-tracking

github.com/...ommit/a5a22b74b9ac5688019cba62669df08562cebd6f (Patch Commit) patch

www.vulncheck.com/...-global-buffer-overflow-in-searchforpgn third-party-advisory

cve.org (CVE-2026-56790)

nvd.nist.gov (CVE-2026-56790)

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