What is CVE-2026-73436?

CVE-2026-73436 is a medium-severity vulnerability in Arista Networks Eos, classified under Out-of-bounds Read. CVSS score: 6.5/10. Published 2026-09-16.

How severe is CVE-2026-73436?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Out-of-bounds Read in Arista Networks Eos

CVE-2026-73436

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.

Vulnerability class: Buffer Overflow

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Arista Networks Eos

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read
CWE-1284 — Improper Validation of Specified Quantity in Input

References

psirt@arista.com (vendor-advisory)

Frequently asked questions

What is CVE-2026-73436?: CVE-2026-73436 is a medium-severity vulnerability in Arista Networks Eos, classified under Out-of-bounds Read. CVSS score: 6.5/10. Published 2026-09-16.
How severe is CVE-2026-73436?: Medium severity. CVSS v3 base score is 6.5 out of 10.