CVE-2026-19640 — MEDIUM (4.2)

Vulnerability Description

On affected platforms running Arista EOS, an authenticated user with access to the gNMI (gRPC Network Management Interface) may receive incorrect authorization results, potentially allowing access beyond their currently assigned permissions. This issue was discovered internally by Arista and the company is not aware of any malicious uses of this issue in customer networks.

CVSS Score

4.2

MEDIUM

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

LOW

Integrity

LOW

Availability

NONE

Related Weaknesses (CWE)

CWE-863

References

https://www.arista.com/en/support/advisories-notices/security-advisory/24726-sec

FAQ

What is CVE-2026-19640?

CVE-2026-19640 is a vulnerability with a CVSS score of 4.2 (MEDIUM). On affected platforms running Arista EOS, an authenticated user with access to the gNMI (gRPC Network Management Interface) may receive incorrect authorization results, potentially allowing access bey...

How severe is CVE-2026-19640?

CVE-2026-19640 has been rated MEDIUM with a CVSS base score of 4.2/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-19640?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.