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CVE-2026-56790

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.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:9f05e3122b6df60adbee5a484815db169eec99f6657e273ea5f69836c6142997
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cvss · 2 assertions

{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"LOCAL","baseScore":7,"baseSeverity":"HIGH","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"PASSIVE","valueDensity":"NOT_DEFINED","vectorString":"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","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"L…

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:c6035957681bdcd3b8f4f047be918475076d76d67ae35b610cf50635040529ca · sha256:8668d2b30642db9f… · /containers/cna/metrics/0/cvssV4_0

{"metric":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":7.3,"baseSeverity":"HIGH","confidentialityImpact":"LOW","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:c6035957681bdcd3b8f4f047be918475076d76d67ae35b610cf50635040529ca · sha256:8668d2b30642db9f… · /containers/cna/metrics/1/cvssV3_1

Affected products and versions

1 source assertion
{"defaultStatus":"unaffected","packageURL":"pkg:github/canboat/canboat","product":"canboat","repo":"https://github.com/canboat/canboat","vendor":"canboat","versions":[{"lessThanOrEqual":"6.22","status":"affected","version":"0","versionType":"custom"},{"status":"unaffected","version":"a5a22b74b9ac5688019cba62669df08562cebd6f","versionType":"git"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:c6035957681bdcd3b8f4f047be918475076d76d67ae35b610cf50635040529ca · sha256:8668d2b30642db9f… · /containers/cna/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"LOCAL","baseScore":7,"baseSeverity":"HIGH","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"PASSIVE","valueDensity":"NOT_DEFINED","vectorString":"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","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"L…
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:c6035957681bdcd3b8f4f047be918475076d76d67ae35b610cf50635040529ca · sha256:8668d2b30642db9f… · /containers/cna/metrics/0/cvssV4_0
{"metric":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":7.3,"baseSeverity":"HIGH","confidentialityImpact":"LOW","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:c6035957681bdcd3b8f4f047be918475076d76d67ae35b610cf50635040529ca · sha256:8668d2b30642db9f… · /containers/cna/metrics/1/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-193","description":"Off-by-one Error","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:c6035957681bdcd3b8f4f047be918475076d76d67ae35b610cf50635040529ca · sha256:8668d2b30642db9f… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions
{"name":"Patch Commit","tags":["patch"],"url":"https://github.com/canboat/canboat/commit/a5a22b74b9ac5688019cba62669df08562cebd6f"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c6035957681bdcd3b8f4f047be918475076d76d67ae35b610cf50635040529ca · sha256:8668d2b30642db9f… · /containers/cna/references/2
{"name":"Researcher Disclosure","tags":["technical-description","exploit"],"url":"https://github.com/canboat/canboat/issues/644"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c6035957681bdcd3b8f4f047be918475076d76d67ae35b610cf50635040529ca · sha256:8668d2b30642db9f… · /containers/cna/references/0
{"name":"Pull Request","tags":["issue-tracking"],"url":"https://github.com/canboat/canboat/pull/649"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c6035957681bdcd3b8f4f047be918475076d76d67ae35b610cf50635040529ca · sha256:8668d2b30642db9f… · /containers/cna/references/1
{"tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/canboat-off-by-one-global-buffer-overflow-in-searchforpgn"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c6035957681bdcd3b8f4f047be918475076d76d67ae35b610cf50635040529ca · sha256:8668d2b30642db9f… · /containers/cna/references/3

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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