CVE-2026-4890 CVE-2026-4890
Remote attackers can cause a denial of service in dnsmasq by sending crafted DNS packets during DNSSEC validation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-4890?
CVE-2026-4890 is a high-severity denial of service vulnerability in dnsmasq, published on 11 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A Denial of Service (DoS) vulnerability in the DNSSEC validation of dnsmasq allows remote attackers to cause a denial of service via a crafted DNS packet.
Weakness: CWE-835
Which versions are affected by CVE-2026-4890?
How do I fix CVE-2026-4890?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-4890 being exploited?
There is no known exploitation of CVE-2026-4890 in the wild and no public exploit code.
Sources
Also known as ALPINE-CVE-2026-4890, AZL-86772, BELL-CVE-2026-4890, CLEANSTART-2026-PV24494, DEBIAN-CVE-2026-4890, GHSA-32px-jfgq-53xf and 1 more.