CVE-2026-4893 CVE-2026-4893
Remote attackers can bypass source checks and disclose information via crafted DNS packets in dnsmasq.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-4893?
CVE-2026-4893 is a medium-severity 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
An information disclosure vulnerability in dnsmasq allows remote attackers to bypass source checks via a crafted DNS packet with RFC 7871 client subnet information.
Which versions are affected by CVE-2026-4893?
How do I fix CVE-2026-4893?
Upgrade to a fixed version.
Is CVE-2026-4893 being exploited?
There is no known exploitation of CVE-2026-4893 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as ALPINE-CVE-2026-4893, AZL-86760, BELL-CVE-2026-4893, CLEANSTART-2026-QZ78916, DEBIAN-CVE-2026-4893, GHSA-4rrv-pmrh-2vc4 and 1 more.