CVE-2026-56790 | CANBoat through 6.22, fixed in commit a5a22b7, contains an o… | CVSS 7.3 HIGH

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.

Metadata

CVE ID: CVE-2026-56790
State: PUBLISHED
Assigner: VulnCheck
Reserved: 2026-06-23 01:24 UTC
Published: 2026-06-25 18:14 UTC
Last updated: 2026-06-25 18:14 UTC
Primary CWE: CWE-193
Off-by-one Error
Vendor / Product: canboat / canboat
Sources: cve.org · NVD

Severity & Metrics

7.3 HIGH CVSS 3.1

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

Affected products (1)

Vendor	Product	Platform	Versions
canboat	canboat	—	0 ≤ 6.22, a5a22b74b9ac5688019cba62669df08562cebd6f

Weakness (CWE)

CWE	Source	Description
CWE-193	cna	Off-by-one Error

CVSS scores (2)

Score	Severity	Version	Source	Vector
7.3	HIGH	3.1	cna	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:H
7.0	HIGH	4.0	cna	CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N

References (4)

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