CVE-2026-73436: Arista Networks Eos

Medium severity, CVSS 6.5. EPSS: 0.3% chance of exploitation in the next 30 days.

On affected platforms running Arista EOS with OSPFv2 and OSPFv2 segment routing configured, a specially crafted OSPFv2 packet from an adjacent OSPF neighbor may cause OSPF to restart unexpectedly.

Affected products

• Arista Networks Eos: from 4.36.0F, up to and including 4.36.1F; from 4.35.0F, up to and including 4.35.5M; from 4.34.0F, up to and including 4.34.7.1M; from 4.33.0F, up to and including 4.33.9M; from 1.0.0, before 4.33.0F (fixed in 4.33.0F)

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