CVE-2026-56790
HighCVSS 7.3Exploitation Probability (EPSS)
Low risk12th percentile — higher than 12% of all known CVEs
Summary
In CANBoat through version 6.22 (fixed in commit a5a22b7), an off-by-one global buffer overflow vulnerability exists in the searchForPgn() function in analyzer/pgn.c. Attackers can send a crafted NMEA-2000 message with an out-of-range PGN value over CAN bus or N2K-over-IP, causing an out-of-bounds array access and application crash.
Risk Assessment
The risk is remote denial of service (DoS) by sending a specially crafted NMEA-2000 frame, potentially disrupting monitoring or control systems based on CANBoat.
Recommendation
Immediately update CANBoat to a version containing commit a5a22b7 or later. If updating is not possible, restrict access to CAN/N2K-over-IP interfaces to trusted sources only.
Original NVD description (English source)
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.