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CVE-2026-19641

EOS · Vulnerability

CVSS 3.1 5.3 MEDIUMCVSS 4.0 6.9 MEDIUMCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-19641

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-19641

Published

EOS

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Arista Networks",
                    "product": "EOS",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "4.36.0",
                            "lessThanOrEqual": "4.36.0F",
                            "versionType": "custom"
                        },
                        {
                            "status": "affected",
                            "version": "4.35.0",
                            "lessThanOrEqual": "4.35.5M",
                            "versionType": "custom"
                        },
                        {
                            "status": "affected",
                            "version": "4.34.0",
                            "lessThanOrEqual": "4.34.7.1M",
                            "versionType": "custom"
                        },
                        {
                            "status": "affected",
                            "version": "0.0.0",
                            "lessThanOrEqual": "4.33.8M",
                            "versionType": "custom"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }

Original source record · Cite this exact observation · Complete original publisher JSON