CVE-2026-112062 lwIP through 2.2.1 Stack Out-of-Bounds Write via mDNS Search Response Handler
Adjacent attackers can cause stack buffer overflows and potential code execution by sending malformed mDNS responses to devices using the lwIP library.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-112062?
CVE-2026-112062 is a medium-severity memory corruption vulnerability in lwIP, published on 18 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-121
Which versions are affected by CVE-2026-112062?
How do I fix CVE-2026-112062?
No fix has been published for CVE-2026-112062 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-112062 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-112062 exists.
Sources
Also known as DEBIAN-CVE-2026-112062, GHSA-7m6v-7jf3-5x4h, UBUNTU-CVE-2026-112062.