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 legit (CVE-2026-19641)

Why this deserves its current priority

CVSS is 6.9. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Arista Networks/EOS (generic), Arista Networks/EOS (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Arista Networks/EOSgeneric	>=4.36.0 <=4.36.0F \|\| >=4.35.0 <=4.35.5M \|\| >=4.34.0 <=4.34.7.1M \|\| >=0.0.0 <=4.33.8M	Not reported
Arista Networks/EOSgeneric	4.36.0 \|\| 4.35.0 \|\| 4.34.0 \|\| 0.0.0	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Arista Networks/EOS, Arista Networks/EOS.
Review the reported fix. Source-reported solution: The recommended resolution is to upgrade to a remediated software version at your earliest convenience. Arista recommends customers move to the latest version of each release that contains all the fixes listed below. For more information about upgrading see EOS User Manual: Upgrades and Downgrades. CVE-2026-19641 has been fixed in the following releases: * 4.36.1F and later releases in the 4.36.x train. * 4.35.6M and later releases in the 4.35.x train. * 4.34.8M and later releases in the 4.34.x train. * 4.33.9M and later releases in the 4.33.x train.

Evidence timeline and material changes

Published upstream
Sep 15, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 16, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 15, 2026

Sources and claim methodology

Source referencearista.com

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

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 legitCVE-2026-19641

Key facts