CVE-2025-68468 Avahi has a reachable assertion in lookup_multicast_callback
An attacker can crash the Avahi daemon by sending unsolicited mDNS announcements with short-TTL CNAME records, causing a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2025-68468?
CVE-2025-68468 is a medium-severity denial of service vulnerability in avahi, published on 12 Jan 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite. In 0.9-rc2 and earlier, avahi-daemon can be crashed by sending unsolicited announcements containing CNAME resource records pointing it to resource records with short TTLs. As soon as they expire avahi-daemon crashes.
Weakness: CWE-617
Which versions are affected by CVE-2025-68468?
It affects 1 product.
Products include Avahi Avahi.
How do I fix CVE-2025-68468?
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-2025-68468 being exploited?
There is no known exploitation of CVE-2025-68468 in the wild and no public exploit code.
Other vulnerabilities in avahi
Sources
Also known as ALPINE-CVE-2025-68468, AZL-74274, AZL-74288, BELL-CVE-2025-68468, DEBIAN-CVE-2025-68468, ECHO-7f70-08b9-6df6 and 4 more.