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Vulnerability record · CVE-2026-12220 · published 15 June 2026

CVE-2026-12220: Memory buffer overflow vulnerability

A vulnerability has been found in Yealink SIP-T46U 108.86.0.118. This affects the function mod_upgrade.SparePartsUpload of the file /api/upgrade/accupgradebychunk of the component Firmware Chunk Upload handler. Such manipulation of the argument uid leads to stack-based buffer overflow. The attack can only be initiated within the local network. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure and is working on a patch to fix it.

7.3 CVSS 4.0 High EPSS 0.37% · top 71.6% CWE-119 · Memory buffer overflowCWE-121 · Stack-based buffer overflow Deferred
7.3CVSS 4.0 base score, v2 7.7
0.37%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
24 Jul 2026Last modified by NVD

Description

A vulnerability has been found in Yealink SIP-T46U 108.86.0.118. This affects the function mod_upgrade.SparePartsUpload of the file /api/upgrade/accupgradebychunk of the component Firmware Chunk Upload handler. Such manipulation of the argument uid leads to stack-based buffer overflow. The attack can only be initiated within the local network. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure and is working on a patch to fix it.

CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
http://cdn2.v50to.cc/T46U/T46U_mod_upgrade_SparePartsUpload_stack_overflow.zip
https://vuldb.com/cve/CVE-2026-12220
https://vuldb.com/submit/834205
https://vuldb.com/vuln/370863
https://vuldb.com/vuln/370863/cti

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Source: NIST National Vulnerability Database (record CVE-2026-12220), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.