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

Quick assessment

Affected
canboat canboat
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

canboat CANBOAT是canboat组织的一款用于解析和分析NMEA 2000/CAN总线海事通信数据的开源工具集。 CANBOAT 6.22及之前版本存在数字错误漏洞，该漏洞源于searchForPgn()函数存在差一错误，允许远程攻击者传递一个带有超范围PGN值的特制NMEA-2000消息以触发越界数组访问并造成拒绝服务。

CVSS 7.3 · High EPSS 0.31% · P22

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 2

VendorProduct Version RangeStatus
canboat canboat ≤ 6.22 affected
a5a22b74b9ac5688019cba62669df08562cebd6f unaffected
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I. Basic Information for CVE-2026-56790

Vulnerability Information
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Vulnerability Title
CANBoat - Off-by-One Global Buffer Overflow in searchForPgn()
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
Off-by-one错误
Source: CVE Program / CVE List V5
Vulnerability Title
CANBOAT 数字错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
canboat CANBOAT是canboat组织的一款用于解析和分析NMEA 2000/CAN总线海事通信数据的开源工具集。 CANBOAT 6.22及之前版本存在数字错误漏洞，该漏洞源于searchForPgn()函数存在差一错误，允许远程攻击者传递一个带有超范围PGN值的特制NMEA-2000消息以触发越界数组访问并造成拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
canboat canboat 0 ~ 6.22 -

II. Public POCs for CVE-2026-56790

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 12089 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
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Trigger conditions & impact
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III. Intelligence Information for CVE-2026-56790

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Patches & Fixes for CVE-2026-56790 (2)

Vendor Advisories for CVE-2026-56790 (1)

Proof of Concept for CVE-2026-56790 (1)

IV. Related Vulnerabilities

Same weakness: CWE-193

V. Comments for CVE-2026-56790

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