🟠 高危 | CVE-2026-11826 — OpenPLC_v3 contains a heap-based buffer overflow i...
🟠 《高危安全漏洞：CVE-2026-11826》
CVSS 评分: 高危（8.7） 状态: Received 发布时间: 2026-07-18
漏洞描述
OpenPLC_v3 contains a heap-based buffer overflow in the getData() function in webserver/core/modbus_master.cpp. getData() reads characters between two delimiters into a caller-supplied buffer with no size parameter and no bounds check. In parseConfig() the function is invoked with the 100-byte heap-allocated MB_device.dev_name field. An authenticated attacker with access to the OpenPLC web interface can send a crafted HTTP POST to the /modbus endpoint with an oversized device_name value; the value is persisted to mbconfig.cfg and parsed on load, overflowing dev_name and overwriting adjacent struct fields (protocol at offset 108, dev_address at offset 109, ip_port at offset 210). A 200-byte payload writes 100 bytes past the allocation. The result is heap corruption leading to runtime crash and denial of service of the PLC process control loop, with attacker-controlled overwrite of adjacent configuration fields. The upstream repository was archived on 2026-04-04 and no fix is expected; the vendor has confirmed the issue does not affect OpenPLC Runtime v4.
🔍 技术细节
| 字段 | 值 |
|---|---|
| CVE ID | CVE-2026-11826 |
| CVSS 评分 | 8.7 🟠 |
| 严重程度 | 高危 |
| CVSS 向量 | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/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-122 |
| 发布时间 | 2026-07-18 |
| 最后更新 | 2026-07-18 |
| 状态 | Received |
| 数据来源 | disclosure@vulncheck.com |