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CVE-2026-112062— lwIP through 2.2.1 Stack Out-of-Bounds Write via mDNS Search Response Handler

Quick assessment

Affected
lwIP lwIP
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

lwIP 2.2.1 及更早版本在 函数中存在一个栈越界写入漏洞。该漏洞允许处于同一链路的相邻攻击者通过发送包含无效域名的 mDNS 响应，破坏栈内存。在设备执行服务搜索期间，本地链路中的攻击者可发送带有过大 RDLENGTH 字段的组播 PTR 响应，或发送 RDLENGTH 小于 6 的 SRV 响应，从而溢出一个 256 字节的栈缓冲区，导致设备崩溃。

CVSS 5.9 · Medium
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I. Basic Information for CVE-2026-112062

Vulnerability Information
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Vulnerability Title
lwIP through 2.2.1 Stack Out-of-Bounds Write via mDNS Search Response Handler
Source: CVE Program / CVE List V5
Vulnerability Description
lwIP through 2.2.1 contains a stack out-of-bounds write vulnerability in mdns_handle_response that allows adjacent attackers to corrupt stack memory by sending mDNS responses with invalid domain names. Attackers on the local link can send multicast PTR answers with oversized RDLENGTH or SRV answers with RDLENGTH below 6 during a service search, overflowing a 256-byte stack buffer and crashing the device.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
lwIP lwIP 0 ~ 2.2.1 -

II. Public POCs for CVE-2026-112062

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III. Intelligence Information for CVE-2026-112062

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Other References for CVE-2026-112062 (4)

IV. Related Vulnerabilities

Same product: lwIP
Same vendor: lwIP
Same weakness: CWE-121

V. Comments for CVE-2026-112062

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