CVE-2026-56111 - Marlin Firmware 2.1.2.7 Out-of-Bounds Write via M421 G-code Handler

CVE-2026-56111 - Marlin Firmware 2.1.2.7 Out-of-Bounds Write via M421 G-code Handler

https://cvefeed.io/rssfeed/latest.atom / Wed, 06/24/2026 - 19:01
CVE ID :CVE-2026-56111
Published : June 24, 2026, 2:31 p.m. | 1 hour, 10 minutes ago
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.
Severity: 9.1 | CRITICAL
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