CVE-2026-112062

CVSS 6.0 (medium) · published 2026-10-18

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.

Weakness: CWE-121

Source: NVD CVE-2026-112062

References

• https://github.com/lwip-tcpip/lwip/blob/STABLE-2_2_1_RELEASE/src/apps/mdns/mdns.c
• https://github.com/lwip-tcpip/lwip/commit/ab2f69c7d8980c01cdd67ed4b23ac61118ed0205
• https://hackmd.io/@haindpwn/lwip-mdns-search-result-domain-oob-write
• https://www.vulncheck.com/advisories/lwip-through-2.2.1-stack-out-of-bounds-write-via-mdns-search-response-handler
• https://hackmd.io/@haindpwn/cve-2026-112062-lwip-mdns-search-result-domain-oob-write

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