What is CVE-2026-19655?

CVE-2026-19655 is a medium-severity vulnerability in Arista Networks Eos, classified under Improper Input Validation. CVSS score: 6.5/10. Published 2026-09-15.

How severe is CVE-2026-19655?

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

Improper input validation in Arista Networks Eos

CVE-2026-19655

On affected platforms running Arista EOS with Dynamic Host Configuration Protocol (DHCP) relay/snooping configured with the information option (Option 82), or with the DHCP server configured with match criteria based on the information option, an unauthenticated attacker connected to a client-facing VLAN(s) where the relay is configured can send a specially crafted packet that causes the DHCP Relay service to restart.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

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-20 — Improper Input Validation

References

psirt@arista.com (vendor-advisory)

Frequently asked questions

What is CVE-2026-19655?: CVE-2026-19655 is a medium-severity vulnerability in Arista Networks Eos, classified under Improper Input Validation. CVSS score: 6.5/10. Published 2026-09-15.
How severe is CVE-2026-19655?: Medium severity. CVSS v3 base score is 6.5 out of 10.