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.
Fix
Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.
Change history 4
- StatusAwaiting Analysis → PublishedNVD modified 2026-10-19 17:56
- StatusReceived → Awaiting AnalysisNVD modified 2026-10-19 21:13
- References+1 references (now 5)NVD modified 2026-10-19 18:17
- First seenCVSS 6.0NVD modified 2026-10-18 13:16
Affected (CPE criteria) 0
NVD has not attached CPE configurations yet.
References 5
- 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