CVE-2026-19641
Medium
Description
On affected platforms running Arista EOS with password authentication configured, a specially crafted password can create orphan authentication sessions. Repeated exploitation of this issue can exhaust available authentication resources, resulting in legitimate users being unable to log in to the device. This issue was discovered internally by Arista, and the company is not aware of any malicious exploitation of this vulnerability in customer networks.
SeverityMedium
CVSS5.3
Exploit probability—
ProductEOS
PublishedSep 15, 2026
First seenSep 15, 2026
Weakness typeCWE-116CWE-116
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Arista Networks EOS | 4.36.0 ≤ v ≤ 4.36.0F, 4.35.0 ≤ v ≤ 4.35.5M, 4.34.0 ≤ v ≤ 4.34.7.1M, v ≤ 4.33.8M | — |
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