CVE-2026-56790

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Source
https://cve.org/CVERecord?id=CVE-2026-56790
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-56790.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-56790
Published
2026-06-25T18:14:48.573Z
Modified
2026-08-12T16:09:54.568591Z
Severity
  • 7.0 (High) CVSS_V4 - 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 CVSS Calculator
Summary
CANBoat - Off-by-One Global Buffer Overflow in searchForPgn()
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 CAN bus or N2K-over-IP to trigger an out-of-bounds array access and denial of service.

Database specific 
{
    "unresolved_ranges": [
        {
            "source": "AFFECTED_FIELD",
            "extracted_events": [
                {
                    "last_affected": "6.22"
                }
            ]
        },
        {
            "source": "DESCRIPTION",
            "extracted_events": [
                {
                    "fixed": "6.22"
                }
            ]
        }
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56790.json",
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
        "CWE-193"
    ]
}
References

Affected packages

Git / github.com/canboat/canboat

Affected ranges

Type
GIT
Repo
https://github.com/canboat/canboat
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
a5a22b74b9ac5688019cba62669df08562cebd6f
Database specific
Show details 
{
    "source": "REFERENCES"
}

Affected versions

v1.*
v1.0.0
v1.1.0
v1.2.0
v1.2.1
v1.3.0
v4.*
v4.10.0
v4.10.1
v4.11.0
v4.11.1
v4.12.0
v4.2.1
v4.2.2
v4.3.0
v4.4.0
v4.5.0
v4.5.1
v4.6.0
v4.6.1
v4.9.1
v4.9.2
v5.*
v5.0.0
v5.0.1
v5.0.2
v5.1.0
v5.1.1
v5.1.2
v5.1.3
v6.*
v6.0.0
v6.0.1
v6.1.0
v6.1.1
v6.1.2
v6.1.3
v6.1.4
v6.1.5
v6.1.6
v6.1.7
v6.1.8
v6.1.9
v6.2.0
v6.2.1
v6.2.2

Database specific

vanir_signatures_modified 
"2026-08-12T16:09:54Z"
vanir_signatures 
[
    {
        "digest": {
            "function_hash": "168646361418733158296917339245976847655",
            "length": 716.0
        },
        "signature_type": "Function",
        "source": "https://github.com/canboat/canboat/commit/a5a22b74b9ac5688019cba62669df08562cebd6f",
        "id": "CVE-2026-56790-4e64e5e0",
        "deprecated": false,
        "signature_version": "v1",
        "target": {
            "file": "analyzer/fieldtype.c",
            "function": "getMaxRange"
        }
    },
    {
        "digest": {
            "function_hash": "222464156335230568715815585472264728586",
            "length": 526.0
        },
        "signature_type": "Function",
        "source": "https://github.com/canboat/canboat/commit/a5a22b74b9ac5688019cba62669df08562cebd6f",
        "id": "CVE-2026-56790-67749b77",
        "deprecated": false,
        "signature_version": "v1",
        "target": {
            "file": "analyzer/pgn.c",
            "function": "searchForPgn"
        }
    },
    {
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "84804944001708472537401909121786812030",
                "7637280945120140124334134607518106748",
                "245979448189228892888550498670119739206",
                "238056407912069975948210360828863689424",
                "68938824326976598631450060431016958888",
                "263989437318060016459419116078366417946",
                "84430242384305060900685103642622740984",
                "24777401864815532248060354936870385941",
                "38915506900629647424817909979924168794",
                "315987240199776194661868774126886613113",
                "104826243171936960986668911379521780813",
                "89808255146223516690064754196603008458",
                "25810975646970340466747645912118872004",
                "85834876339305817964261666691332803308",
                "139945435346901804202572933081269576134",
                "272087703181985716020628159662661709470",
                "319976298555995032642663567821675244287",
                "209330561589510182748005471655590004350",
                "110892944002911242813675019736756640399",
                "41110381038975873116901829162051431332",
                "97499783404307896181566490242486018189",
                "136065763809526117010996913358501953116"
            ]
        },
        "signature_type": "Line",
        "source": "https://github.com/canboat/canboat/commit/a5a22b74b9ac5688019cba62669df08562cebd6f",
        "id": "CVE-2026-56790-78667822",
        "deprecated": false,
        "signature_version": "v1",
        "target": {
            "file": "analyzer/pgn.c"
        }
    },
    {
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "163098978244034999688155661080979170026",
                "92690140463484657956663568309384359244",
                "31122712908405352380486592617022802753",
                "255019475668244505269973778839645276821"
            ]
        },
        "signature_type": "Line",
        "source": "https://github.com/canboat/canboat/commit/a5a22b74b9ac5688019cba62669df08562cebd6f",
        "id": "CVE-2026-56790-b732f649",
        "deprecated": false,
        "signature_version": "v1",
        "target": {
            "file": "analyzer/fieldtype.c"
        }
    }
]
source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-56790.json"