CVE-2026-112062

EUVD-2026-103504
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
VulnCheckCNA
5.9 MEDIUM
ADJACENT_NETWORK
HIGH
NONE
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 12.96%
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
lwip_projectlwip
𝑥
≤ 2.2.1
CNA
Debian logo
Debian Releases
Debian Product
Codename
lwip
bookworm
unimportant
forky
unimportant
sid
unimportant
trixie
unimportant
Common Weakness Enumeration
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