CVE-2026-56790 CANBoat - Off-by-One Global Buffer Overflow in searchForPgn()
Remote attackers can crash the CANBoat application by sending crafted NMEA-2000 messages with out-of-range PGN values, causing a buffer overflow.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-56790?
CVE-2026-56790 is a high-severity vulnerability in canboat, published on 25 Jun 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-193
Which versions are affected by CVE-2026-56790?
How do I fix CVE-2026-56790?
No fix has been published for CVE-2026-56790 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-56790 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-56790 exists.
Sources
Also known as GHSA-p2cc-x7hq-6jvm.