CVE-2026-112062 PUBLISHED

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.

• HaiND from the Post and Telecommunication Institute of Technology finder

• https://hackmd.io/@haindpwn/lwip-mdns-search-result-domain-oob-write
• https://github.com/lwip-tcpip/lwip/commit/ab2f69c7d8980c01cdd67ed4b23ac61118ed0205
• https://github.com/lwip-tcpip/lwip/blob/STABLE-2_2_1_RELEASE/src/apps/mdns/mdns.c
• VulnCheck Advisory: lwIP through 2.2.1 Stack Out-of-Bounds Write via mDNS Search Response Handler

• Stack-based Buffer Overflow CWE