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CVE PROGRAM SOURCE RECORD8.6 High

CVE-2026-12221

Yealink SIP-T46U Firmware Chunk Upload upgrade sprintf stack-based overflow

Description

A vulnerability was found in Yealink SIP-T46U 108.86.0.118. This impacts the function sprintf of the file /api/upgrade/upgrade of the component Firmware Chunk Upload Handler. Performing a manipulation of the argument uid/start_offset results in stack-based buffer overflow. The attack needs to be approached within the local network. The exploit has been made public and could be used. The vendor was contacted early about this disclosure and is working on a patch to fix it.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Yealink SIP-T46U

  • 108.86.0.118affected

References