What is CVE-2026-73455?

CVE-2026-73455 is a high-severity vulnerability in Arista Networks Eos, classified under Improper Handling of Length Parameter Inconsistency. CVSS score: 7.5/10. Published 2026-09-16.

How severe is CVE-2026-73455?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Arista Networks Eos

CVE-2026-73455

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.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Arista Networks Eos

Weakness classification (CWE)

CWE-130 — Improper Handling of Length Parameter Inconsistency

References

psirt@arista.com (vendor-advisory)

Frequently asked questions

What is CVE-2026-73455?: CVE-2026-73455 is a high-severity vulnerability in Arista Networks Eos, classified under Improper Handling of Length Parameter Inconsistency. CVSS score: 7.5/10. Published 2026-09-16.
How severe is CVE-2026-73455?: High severity. CVSS v3 base score is 7.5 out of 10.