CVE-2026-112062
lwIP through 2.2.1 Stack Out-of-Bounds Write via mDNS Search Response Handler
lwIP lwIP
CVSS
6.0MediumExploitationPublic exploit codeCISA's assessment says proof of concept code is public, assessed 19 Oct 2026. Not in the KEV catalogCISA via CVE List
Exploit odds (EPSS)0.23%Chance of exploitation activity in the next 30 days, higher than 12% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
What fixes it
No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.
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.
Text from CVE List
Affected versions 1
- lwIPaffected: all versions through 2.2.1CVE List
References 5
- github.com/lwip-tcpip/lwip/commit/ab2f69c7d8980c01cdd67ed4b23ac61118ed0205Fixvia CVE List
- hackmd.io/@haindpwn/lwip-mdns-search-result-domain-oob-writeAdvisoryvia CVE List
- vulncheck.com/advisories/lwip-through-2.2.1-stack-out-of-bounds-write-via-mdns-search-response-handlerAdvisoryvia CVE List
- hackmd.io/@haindpwn/cve-2026-112062-lwip-mdns-search-result-domain-oob-writeExploitvia CVE List
- github.com/lwip-tcpip/lwip/blob/STABLE-2_2_1_RELEASE/src/apps/mdns/mdns.cReferencevia CVE List