CVE-2026-73455 Security Advisory 0173
A specially crafted packet can cause the OSPFv3 agent to restart, leading to a denial of service on Arista EOS devices.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-73455?
CVE-2026-73455 is a high-severity denial of service vulnerability in Arista Networks EOS, published on 16 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
On affected platforms running Arista EOS with Open Shortest Path First version 3 (OSPFv3) configured, a specially crafted packet can cause the OSPFv3 agent to restart unexpectedly.
Weakness: CWE-130
Which versions are affected by CVE-2026-73455?
How do I fix CVE-2026-73455?
No fix has been published for CVE-2026-73455 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-2026-73455 being exploited?
There is no known exploitation of CVE-2026-73455 in the wild and no public exploit code.
Sources
Also known as GHSA-qpgp-r7c9-594m.