CVE-2026-73455: Arista Networks Eos

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• Arista Networks Eos: from 1.0.0, before 4.33.0F (fixed in 4.33.0F); from 4.33.0F, up to and including 4.33.8M; from 4.34.0F, up to and including 4.34.6M; from 4.35.0F, up to and including 4.35.4M; from 4.36.0F, up to and including 4.36.0.1F

Published 2026-09-16. Last modified 2026-09-16.