Cyber Resilience

CVE-2026-56790

HighPublic PoC

Published: 25 June 2026

Published
25 June 2026
Modified
26 June 2026
KEV Added
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Patch
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CVSS Score v4 7.0 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS Score 0.0022 11.9th percentile
Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2026-56790 is a high-severity Off-by-one Error (CWE-193) vulnerability. Its CVSS base score is 7.0 (High).

Operationally, ranked at the 11.9th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

EU & UK References

Vulnerability details

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…

more

CAN bus or N2K-over-IP to trigger an out-of-bounds array access and denial of service.

CWE(s)
CWE-193

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References