CVE-2026-4892 CVE-2026-4892
Local attackers can execute arbitrary code with root privileges via a crafted DHCPv6 packet due to a heap-based out-of-bounds write in dnsmasq.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-4892?
CVE-2026-4892 is a high-severity memory corruption vulnerability in dnsmasq, published on 11 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A heap-based out-of-bounds write vulnerability in the DHCPv6 implementation of dnsmasq allows local attackers to execute arbitrary code with root privileges via a crafted DHCPv6 packet.
Weakness: CWE-122
Which versions are affected by CVE-2026-4892?
How do I fix CVE-2026-4892?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-4892 being exploited?
There is no known exploitation of CVE-2026-4892 in the wild and no public exploit code.
Sources
Also known as ALPINE-CVE-2026-4892, BELL-CVE-2026-4892, CLEANSTART-2026-CP78946, DEBIAN-CVE-2026-4892, GHSA-m62j-63mf-xr95, UBUNTU-CVE-2026-4892.