CVE-2026-56790
HIGHCANBoat - Off-by-One Global Buffer Overflow in searchForPgn()
Title source: cnaDescription
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.
References (4)
Core 4
Core References
Exploit technical-description
exploit
Researcher Disclosure
https://github.com/canboat/canboat/issues/644
Patch patch
Patch Commit
https://github.com/canboat/canboat/commit/a5a22b74b9ac5688019cba62669df08562cebd6f
Third Party Advisory third-party-advisory
https://www.vulncheck.com/advisories/canboat-off-by-one-global-buffer-overflow-in-searchforpgn
Scores
CVSS v3
7.3
EPSS
0.0022
EPSS Percentile
11.9%
Attack Vector
LOCAL
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:H
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
no
Technical Impact
partial
Details
CWE
CWE-193
Status
published
Products (2)
canboat/canboat
< 6.22
canboat/canboat
a5a22b74b9ac5688019cba62669df08562cebd6f
Published
Jun 25, 2026
Tracked Since
Jun 26, 2026