Vulnerability-Lookup

CVE-2026-56790 (GCVE-0-2026-56790)

Vulnerability from cvelistv5 – Published: 2026-06-25 18:14 – Updated: 2026-07-14 21:34 X_Open Source

Title

CANBoat - Off-by-One Global Buffer Overflow in searchForPgn()

Summary

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.

Severity

7 (High)


                        
                          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

7.3 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:H

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-25 21:36 UTC

CWE

CWE-193 - Off-by-one Error

Assigner

VulnCheck mitre root

References

4 references

URL	Tags
https://github.com/canboat/canboat/issues/644	technical-descriptionexploit
https://github.com/canboat/canboat/pull/649	issue-tracking
https://github.com/canboat/canboat/commit/a5a22b7…	patch
https://www.vulncheck.com/advisories/canboat-off-…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version	CPE status
canboat	canboat	Affected: 0 , ≤ 6.22 (custom) Unaffected: a5a22b74b9ac5688019cba62669df08562cebd6f (git)	guessed

Date Public

2026-06-09 00:00

Credits

FuzzingLabs

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-56790

Vulnerability from fkie_nvd - Published: 2026-06-25 19:16 - Updated: 2026-07-14 22:17

Severity

7.3 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:H

Summary

References

	URL	Tags
	disclosure@vulncheck.com	https://github.com/canboat/canboat/commit/a5a22b74b9ac5688019cba62669df08562cebd6f
	disclosure@vulncheck.com	https://github.com/canboat/canboat/issues/644
	disclosure@vulncheck.com	https://github.com/canboat/canboat/pull/649
	disclosure@vulncheck.com	https://www.vulncheck.com/advisories/canboat-off-by-one-global-buffer-overflow-in-searchforpgn

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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      "url": "https://www.vulncheck.com/advisories/canboat-off-by-one-global-buffer-overflow-in-searchforpgn"
    }
  ],
  "sourceIdentifier": "disclosure@vulncheck.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-193"
        }
      ],
      "source": "disclosure@vulncheck.com",
      "type": "Secondary"
    }
  ]
}

GHSA-P2CC-X7HQ-6JVM

Vulnerability from github – Published: 2026-06-25 21:31 – Updated: 2026-06-25 21:31

Details

Severity

7.3 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:H

7.0 (High)


                  
                    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

Show details on source website

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{
  "affected": [],
  "aliases": [
    "CVE-2026-56790"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-193"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-25T19:16:45Z",
    "severity": "HIGH"
  },
  "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.",
  "id": "GHSA-p2cc-x7hq-6jvm",
  "modified": "2026-06-25T21:31:30Z",
  "published": "2026-06-25T21:31:30Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-56790"
    },
    {
      "type": "WEB",
      "url": "https://github.com/canboat/canboat/issues/644"
    },
    {
      "type": "WEB",
      "url": "https://github.com/canboat/canboat/pull/649"
    },
    {
      "type": "WEB",
      "url": "https://github.com/canboat/canboat/commit/a5a22b74b9ac5688019cba62669df08562cebd6f"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/canboat-off-by-one-global-buffer-overflow-in-searchforpgn"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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Confirmed: The vulnerability has been validated from an analyst's perspective.
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Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-56790 (GCVE-0-2026-56790)

FKIE_CVE-2026-56790

GHSA-P2CC-X7HQ-6JVM

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Nomenclature

Related by attack behaviour