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CVE-2026-56111

Marlin Firmware through 2.1.2.7, fixed in commit 1f255d1, when built with MESH_BED_LEVELING enabled, contains an out-of-bounds write vulnerability in the M421 G-code handler that allows attackers to corrupt firmware memory by supplying out-of-range X and Y grid indices. Attackers can send a single crafted G-code command via USB serial, network interface, or malicious gcode file to write an attacker-controlled 32-bit float value past the z_values array bounds, corrupting adjacent firmware variabl
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:62ebf4bd684d437c914a4e5503fd56158a65c76d19a8ab3ce4d9639931a65285
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":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":9.1,"baseSeverity":"CRITICAL","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:4f6b05904e8b2f7774683d9d1264013526c1a5ab3b43e5ccb141fc82afe87341 · sha256:8eca01621f13de40… · /containers/cna/metrics/1/cvssV3_1

{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":8.3,"baseSeverity":"HIGH","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact…

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:4f6b05904e8b2f7774683d9d1264013526c1a5ab3b43e5ccb141fc82afe87341 · sha256:8eca01621f13de40… · /containers/cna/metrics/0/cvssV4_0

Affected products and versions

1 source assertion
{"defaultStatus":"affected","packageURL":"pkg:github/MarlinFirmware/Marlin","product":"Marlin","repo":"https://github.com/MarlinFirmware/Marlin","vendor":"MarlinFirmware","versions":[{"lessThanOrEqual":"2.1.2.7","status":"affected","version":"0","versionType":"custom"},{"status":"unaffected","version":"1f255d16ec2d456454fd444494cfb338d62b0fa1","versionType":"git"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:4f6b05904e8b2f7774683d9d1264013526c1a5ab3b43e5ccb141fc82afe87341 · sha256:8eca01621f13de40… · /containers/cna/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":9.1,"baseSeverity":"CRITICAL","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:4f6b05904e8b2f7774683d9d1264013526c1a5ab3b43e5ccb141fc82afe87341 · sha256:8eca01621f13de40… · /containers/cna/metrics/1/cvssV3_1
{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":8.3,"baseSeverity":"HIGH","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact…
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:4f6b05904e8b2f7774683d9d1264013526c1a5ab3b43e5ccb141fc82afe87341 · sha256:8eca01621f13de40… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-129","description":"Improper Validation of Array Index","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:4f6b05904e8b2f7774683d9d1264013526c1a5ab3b43e5ccb141fc82afe87341 · sha256:8eca01621f13de40… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions
{"name":"Patch Commit","tags":["patch"],"url":"https://github.com/MarlinFirmware/Marlin/commit/1f255d16ec2d456454fd444494cfb338d62b0fa1"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:4f6b05904e8b2f7774683d9d1264013526c1a5ab3b43e5ccb141fc82afe87341 · sha256:8eca01621f13de40… · /containers/cna/references/2
{"name":"Researcher Disclosure","tags":["technical-description","exploit"],"url":"https://github.com/MarlinFirmware/Marlin/issues/28467"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:4f6b05904e8b2f7774683d9d1264013526c1a5ab3b43e5ccb141fc82afe87341 · sha256:8eca01621f13de40… · /containers/cna/references/0
{"name":"Pull Request","tags":["issue-tracking"],"url":"https://github.com/MarlinFirmware/Marlin/pull/28468"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:4f6b05904e8b2f7774683d9d1264013526c1a5ab3b43e5ccb141fc82afe87341 · sha256:8eca01621f13de40… · /containers/cna/references/1
{"tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/marlin-firmware-out-of-bounds-write-via-m421-g-code-handler"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:4f6b05904e8b2f7774683d9d1264013526c1a5ab3b43e5ccb141fc82afe87341 · sha256:8eca01621f13de40… · /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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