CVE-2026-5855— Contiki-NG 缓冲区错误漏洞

Contiki-NG LwM2M TLV Parser Out-of-Bounds Read via Unchecked Buffer Length in lwm2m_tlv_read

Contiki-NG's LwM2M TLV parser lwm2m_tlv_read() in os/services/lwm2m/lwm2m-tlv.c ignores its caller-supplied buffer length argument and reads up to six bytes from the input buffer with no bounds check. The caller in lwm2m-engine.c iterates while there is at least one byte remaining, so a crafted CoAP WRITE to any LwM2M endpoint whose final TLV supplies exactly one byte triggers up to five out-of-bounds reads of heap memory adjacent to the CoAP input buffer, disclosing memory contents (including key material and peer addresses) through the parsed tlv->id, tlv->length, and tlv->value fields. Corrupted tlv_len derived from the out-of-bounds memory further corrupts the caller's parse offset. In LwM2M NoSec mode, the default for constrained devices, no authentication is required.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

跨界内存读

Contiki-NG 缓冲区错误漏洞

Contiki-NG是Contiki-NG组织开源的一个适用于物联网中资源受限设备的操作系统。 Contiki-NG 存在缓冲区错误漏洞，该漏洞源于LwM2M TLV解析器lwm2m_tlv_read()忽略调用者提供的缓冲区长度参数且无边界检查，可能导致越界读取堆内存，泄露内存内容（包括密钥材料和对端地址），并破坏解析偏移。在LwM2M NoSec模式下，攻击者无需认证即可触发。

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