CVE-2026-56790Public exploit

Decoding process crash via out-of-range PGN lookup

Published Jun 25, 2026 · Updated Jun 25, 2026

Global buffer over-read in CANboat 6.22 and earlier allows remote attackers to crash decoding processes via a crafted NMEA 2000 message. The searchForPgn() binary search treats pgnListSize as a valid closed upper bound, so an out-of-range PGN indexes pgnList[] one element past its end. Exposure requires a direct CAN-bus frame or an N2K-over-IP or log path that feeds the analyzer; triggering it interrupts the decoding process.

CVSS severity7.0
High
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Global buffer over-read in CANboat 6.22 and earlier allows remote attackers to crash decoding processes via a crafted NMEA 2000 message. The searchForPgn() binary search treats pgnListSize as a valid closed upper bound, so an out-of-range PGN indexes pgnList[] one element past its end. Exposure requires a direct CAN-bus frame or an N2K-over-IP or log path that feeds the analyzer; triggering it interrupts the decoding process.

The record

CVE
CVE-2026-56790
Published
Jun 25, 2026
Updated
Jun 25, 2026
Vendor
CANboat
Product
CANboat
Classifications
CWE-193, T1499.004
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=6.22

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

CANboat · CANboatversion=0 <=6.22

Published CVSS scores

7.0VulnCheck CNACVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N
7.3VulnCheck CNACVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-193Off-by-one Error
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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