CVE-2026-56111 | BDVDB-2026-342902 Detail

Description#

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.

Impact#

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Exploit#

History#

1. Version 12026-06-24Record published in the CVE List.
2. Version 22026-11-08Most recent update recorded in the CVE List.