CVE-2026-34120 Heap-based Buffer Overflow Vulnerability Leading to Denial-of-Service in TP-Link Tapo C520WS
An attacker on the same network can cause a denial-of-service condition in TP-Link Tapo C520WS cameras by triggering a heap-based buffer overflow via crafted video stream payloads.
- 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-2026-34120?
CVE-2026-34120 is a high-severity memory corruption vulnerability in TP-Link Systems Inc. Tapo C520WS v2.6, published on 2 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A heap-based buffer overflow vulnerability was identified in TP-Link Tapo C520WS v2.6 within the asynchronous parsing of local video stream content due to insufficient alignment and validation of buffer boundaries when processing streaming inputs.An attacker on the same network segment could trigger heap memory corruption conditions by sending crafted payloads that cause write operations beyond allocated buffer boundaries. Successful exploitation causes a Denial-of-Service (DoS) condition, causing the device’s process to crash or become unresponsive.
Weakness: CWE-122
Which versions are affected by CVE-2026-34120?
It affects 1 product.
Products include Tp-Link Tapo C520ws Firmware.
How do I fix CVE-2026-34120?
No fix has been published for CVE-2026-34120 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-2026-34120 being exploited?
There is no known exploitation of CVE-2026-34120 in the wild and no public exploit code.
Other vulnerabilities in TP-Link Systems Inc. Tapo C520WS v2.6
- CVE-2026-34121 Authentication Bypass in DS Configuration Service via HTTP Request Parsing Differential of TP-Link Tapo C520WS
- CVE-2026-8714 Denial-of-Service Vulnerability in RTSP Input Handling on TP-Link's Tapo C520WS
- CVE-2026-34118 Heap-based Buffer Overflow Vulnerability Leading to Denial-of-Service in TP-Link Tapo C100, C101, C210 & C520WS
- CVE-2026-34119 Heap-based Buffer Overflow Vulnerability Leading to Denial-of-Service in TP-Link Tapo C520WS
- CVE-2026-34122 Stack-based Buffer Overflow Leading to Denial of Service in TP-Link Tapo C520WS
Sources
Also known as GHSA-m7f4-p6pg-38mf.