CVE-2026-56790: CANBoat - Off-by-One Global Buffer Overflow in searchForPgn()

Severity: high (CVSS 7.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-25 · updated 2026-10-25
Weakness: CWE-193

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.

Affected products

canboat: through 6.22

References

https://github.com/canboat/canboat/commit/a5a22b74b9ac5688019cba62669df08562cebd6f
https://github.com/canboat/canboat/issues/644
https://github.com/canboat/canboat/pull/649
https://www.vulncheck.com/advisories/canboat-off-by-one-global-buffer-overflow-in-searchforpgn

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