Zyxel security advisory (AV26-603)

Serial number: AV26-603
Date: June 16, 2026

On June 16, 2026, Zyxel published a security advisory to address vulnerabilities in the following products:

• GS1900 series switches – multiple versions and models

The Cyber Centre encourages users and administrators to review the provided web links and apply the necessary updates.

• Zyxel security advisory for stack-based buffer overflow vulnerability in GS1900 series switches
• Zyxel Advisories