CVE-2026-56111 漏洞深度分析

漏洞概述

CVE 编号： CVE-2026-56111
CVSS 评分： 8.3（HIGH）
CVSS 向量： 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CWE 分类： CWE-129
漏洞状态： Awaiting Analysis
发布时间： 2026-06-24T16:16:32.930
最后更新： 2026-07-14T22:17:18.620

漏洞描述

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.

影响分析

此漏洞的具体影响取决于实际利用场景。"

修复建议

1. 及时关注厂商发布的安全更新和补丁
2. 升级受影响组件到最新版本
3. 如无法立即升级，参考厂商提供的临时缓解措施
4. 加强网络访问控制和监控

参考链接

1. https://github.com/MarlinFirmware/Marlin/commit/1f255d16ec2d456454fd444494cfb338d62b0fa1
2. https://github.com/MarlinFirmware/Marlin/issues/28467
3. https://github.com/MarlinFirmware/Marlin/pull/28468
4. https://www.vulncheck.com/advisories/marlin-firmware-out-of-bounds-write-via-m421-g-code-handler