CVE-2026-12220

HIGH 8.0

Yealink SIP-T46U Firmware Chunk Upload handler accupgradebychunk mod_upgrade.SparePartsUpload stack-based overflow

CVSS Score

8.0

EPSS Score

0.0%

EPSS Percentile

0th

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 but did not respond in any way.

CWE	CWE-121 CWE-119
Vendor	yealink
Product	sip-t46u
Published	Jun 15, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

Affected Versions

Yealink / SIP-T46U

108.86.0.118

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

🔍 CookedMelon (VulDB User) VulDB CNA Team