CVE-2026-73469

Medium

Description

When specific platforms are using Arista EOS with a loose Unicast Reverse Path Forwarding (uRPF) configuration, certain traffic may not be subjected to the intended verification drop. Consequently, traffic that should be dropped based on these routes could still be processed and forwarded by the device. This issue was discovered internally by Arista and the company is not aware of any malicious uses of this issue in customer networks.

SeverityMedium

CVSS5.8

Exploit probability—

ProductEOS

PublishedSep 16, 2026

First seenSep 16, 2026

Weakness typeCWE-863Incorrect authorization

How to fix

Vendor advisories

arista.com/en/support/advisories-notices/security-advisory/24732-security-advisory-0176

Affected products

Product	Affected versions	Fixed in
Arista Networks EOS	4.35.0F ≤ v ≤ 4.35.4M	—

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