CVE-2026-8618 Pre-Authentication Stack-based Buffer Overflow Remote Code Execution in TDDPv2 Subtype 0x91 on Deco M9 Plus
An adjacent unauthenticated attacker can achieve remote code execution or cause denial of service via a stack-based buffer overflow in the TDDPv2 service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-8618?
CVE-2026-8618 is a high-severity memory corruption vulnerability in TP-Link Systems Inc. Deco M9 Plus V2, published on 1 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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.
Weakness: CWE-121
Which versions are affected by CVE-2026-8618?
How do I fix CVE-2026-8618?
No fix has been published for CVE-2026-8618 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-8618 being exploited?
There is no known exploitation of CVE-2026-8618 in the wild and no public exploit code.
Sources
Also known as GHSA-fxpm-c4jc-x283.