CVE-2026-56111
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
Summary
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 variables and causing denial of service or firmware state corruption.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| MarlinFirmware | Marlin | 0 <= 2.1.2.7 | affected |
| MarlinFirmware | Marlin | 1f255d16ec2d456454fd444494cfb338d62b0fa1 | unaffected |
Weaknesses
- CWE-129: Improper Validation of Array Index
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: poc
- Automatable: yes
- Technical Impact: partial
References
- https://github.com/MarlinFirmware/Marlin/issues/28467
- https://github.com/MarlinFirmware/Marlin/pull/28468
- https://github.com/MarlinFirmware/Marlin/commit/1f255d16ec2d456454fd444494cfb338d62b0fa1
- https://www.vulncheck.com/advisories/marlin-firmware-out-of-bounds-write-via-m421-g-code-handler
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