{"id":"CVE-2026-112062","title":"lwip: lwIP: Denial of Service via stack buffer overflow in mDNS response handling (CVE-2026-112062)","summary":"A flaw was found in lwIP. An adjacent attacker on the local network can cause a Denial of Service (DoS) by sending specially crafted multicast Domain Name System (mDNS) responses with invalid domain names or record lengths. Processing thes…","severity":"medium","cvss":5.9,"cvssVector":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H","cvssSource":"vendor","cwe":["CWE-121"],"vendor":"Red Hat","product":"lwIP","affected":["lwIP <= 2.2.1"],"published":"2026-10-18","updated":"2026-10-21","sourceUpdated":"2026-10-21T09:34:49+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-112062.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-112062.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-112062"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-112062"},{"url":"https://hackmd.io/@haindpwn/lwip-mdns-search-result-domain-oob-write"},{"url":"https://github.com/lwip-tcpip/lwip/commit/ab2f69c7d8980c01cdd67ed4b23ac61118ed0205"},{"url":"https://github.com/lwip-tcpip/lwip/blob/STABLE-2_2_1_RELEASE/src/apps/mdns/mdns.c"},{"url":"https://www.vulncheck.com/advisories/lwip-through-2.2.1-stack-out-of-bounds-write-via-mdns-search-response-handler","label":"VulnCheck Advisory: lwIP through 2.2.1 Stack Out-of-Bounds Write via mDNS Search Response Handler"}],"tags":["csaf","vex","red-hat","cve.org","exploit-available"],"epss":0.00356,"epssPercentile":0.29183,"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-19T17:56:07.508494Z"},"ingestedAt":"2026-10-18T12:41:54.059Z","slug":"CVE-2026-112062","body":"## Overview\n\nA flaw was found in lwIP. An adjacent attacker on the local network can cause a Denial of Service (DoS) by sending specially crafted multicast Domain Name System (mDNS) responses with invalid domain names or record lengths. Processing these malformed packets during a service search triggers a stack-based buffer overflow, corrupting memory and causing the affected device to crash.\n\n## Vendor advisories\n\n- **Red Hat VEX** · updated 2026-10-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-112062.json)\n\n**lwip: lwIP: Denial of Service via stack buffer overflow in mDNS response handling**. Released 2026-10-18, updated 2026-10-21.\n\nNot affected:\n\n- All currently supported Red Hat products\n\n## Remediation\n\nRefer to the advisory for fix availability.","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":32.5,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":225090,"id":"CVE-2026-112062","ts":1792435053858,"field":"exploit_available","old":"false","new":"true"}]}