What is CVE-2026-73460?

CVE-2026-73460 is a medium-severity vulnerability in Arista Networks Eos, classified under Incorrect Authorization. CVSS score: 6.1/10. Published 2026-09-16.

How severe is CVE-2026-73460?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Auth bypass in Arista Networks Eos

CVE-2026-73460

On affected platforms running Arista EOS with IS-IS graceful restart enabled, an unauthenticated attacker who can inject a malformed IS-IS LSP PDU packet can cause the IS-IS graceful restart procedure to terminate prematurely. This may result in traffic loss following a restart event.

Vulnerability class: Broken Access Control

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H.

Affected products

Arista Networks Eos

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

psirt@arista.com (vendor-advisory)

Frequently asked questions

What is CVE-2026-73460?: CVE-2026-73460 is a medium-severity vulnerability in Arista Networks Eos, classified under Incorrect Authorization. CVSS score: 6.1/10. Published 2026-09-16.
How severe is CVE-2026-73460?: Medium severity. CVSS v3 base score is 6.1 out of 10.