High 7.7Published Oct 1, 2026

CVE-2026-8618Pre-Authentication Stack-based Buffer Overflow Remote Code Execution in TDDPv2 Subtype 0x91 on Deco M9 Plus

Updated under an hour ago (2026-10-19 07:00 UTC)

Does this affect you?

It affects TP-Link Systems Inc. Deco M9 Plus V2. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.23%, higher than 13% of scored CVEs.

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Every CVE for TP-Link Systems Inc. Deco M9 Plus V2

Exploited in the last 30 days

A stack-based buffer overflow vulnerability exists in the TDDPv2 service (/usr/bin/tddp) on Deco M9 Plus due to insufficient validation of decrypted request data length before it is copied into a fixed-size stack buffer in the subtype 0x91 handler. Successful exploitation may allow an adjacent, unauthenticated attacker to cause a denial of service or achieve arbitrary code execution during the device setup phase through crafted TDDP packets.

CVSS: 7.7 HIGH (v4.0, CNA)CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L
Weakness (CWE): CWE-121
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.23% (percentile 13)
Assigned by: TPLink
NVD analysis: Deferred
Record last updated: Oct 1, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

TP-Link Systems Inc. Deco M9 Plus V2 tp_link_systems:deco_m9_plus_v2 (from the name)	before 1.9.2 Build 20260818	CNA record

References

https://www.tp-link.com/en/support/download/deco-m9-plus/v2/#Firmwarepatch
https://www.tp-link.com/us/support/download/deco-m9-plus/v2/#Firmwarepatch
https://www.tp-link.com/us/support/faq/5322/vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.