CVE-2026-73462 Denial of service in EOS
A network-adjacent attacker can crash the IGMP snooping agent on Arista EOS devices by sending malformed packets, causing multicast traffic flooding.
- 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-2026-73462?
CVE-2026-73462 is a high-severity denial of service vulnerability in Arista Networks EOS, published on 16 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
On affected platforms running Arista EOS with IGMP (Internet Group Management Protocol) snooping configured (enabled by default on all VLANs), a network-adjacent unauthenticated attacker can send malformed network packets on an affected VLAN to cause the IGMP snooping agent to terminate unexpectedly. This results in a temporary disruption of multicast traffic management, which may cause multicast traffic to be flooded to all ports of the affected VLAN until the service recovers. Repeated exploitation could result in a prolonged loss of intended multicast forwarding behavior.
Weakness: CWE-125
Which versions are affected by CVE-2026-73462?
How do I fix CVE-2026-73462?
No fix has been published for CVE-2026-73462 yet. Limit exposure of the affected software until one is available.
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-2026-73462 being exploited?
There is no known exploitation of CVE-2026-73462 in the wild and no public exploit code.
Sources
Also known as GHSA-m8c5-pmmq-7x3q.