CVE-2026-12218: Yealink SIP-t46u

High severity, CVSS 8.0. EPSS: 0.4% chance of exploitation in the next 30 days.

A vulnerability was detected in Yealink SIP-T46U 108.87.50.1. The affected element is the function StartReportInformation of the file /api/inner/beforewifitest of the component Web FastCGI Service. The manipulation of the argument port results in stack-based buffer overflow. Access to the local network is required for this attack. The exploit is now public and may be used. The vendor was contacted early about this disclosure and is working on a patch to fix it.

Affected products

• Yealink SIP-t46u: version 108.87.50.1 only

Published 2026-06-15. Last modified 2026-07-24.