Vulnerability · Published Jun 25, 2026 · Assigned by VulnCheck

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

High 7.3

In plain English

A high-severity security flaw in canboat from canboat. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 24% of all known vulnerabilities).

Severity (CVSS 3.1)7.3High

Exploit odds (30 days)0.3%top 76.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
canboat	canboat	0 – through 6.22

Weakness: CWE-193 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:H

References

Researcher Disclosure technical-description, exploit
Pull Request issue-tracking
Patch Commit patch
https://www.vulncheck.com/advisories/canboat-off-by-one-global-buffer-overflow-in-searchforpgn third-party-advisory