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CVE-2026-12218 Yealink CVE debrief

A high-severity vulnerability, CVE-2026-12218, was detected in Yealink SIP-T46U 108.87.50.1. The vulnerability affects the function StartReportInformation of the file /api/inner/beforewifitest in the Web FastCGI Service component. The manipulation of the argument port results in a 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 but did not respond in any way.

Vendor
Yealink
Product
SIP-T46U
CVSS
HIGH 7.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-15
Original CVE updated
2026-06-27
Advisory published
2026-06-15
Advisory updated
2026-06-27

Who should care

Administrators and users of Yealink SIP-T46U 108.87.50.1, especially those with access to the local network, should be aware of this vulnerability and take necessary actions to mitigate it.

Technical summary

The vulnerability has a CVSS score of 7.3 and is classified as HIGH severity. It is caused by a stack-based buffer overflow in the StartReportInformation function of the /api/inner/beforewifitest file in the Web FastCGI Service component. The vulnerability can be exploited with local network access and has a public exploit available.

Defensive priority

High

Recommended defensive actions

  • Apply patches or updates provided by the vendor as soon as possible.
  • Restrict access to the local network to minimize the attack surface.
  • Monitor for any suspicious activity related to the affected component.

Evidence notes

The CVE record was published and modified on 2026-06-15T06:16:22.673Z. The vulnerability details were obtained from the NVD and other sources.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-12218 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-12218

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-12218 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-12218

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.