Vulnerability · Published Apr 2, 2026 · Assigned by TPLink
CVE-2026-34120Heap-based Buffer Overflow Vulnerability Leading to Denial-of-Service in TP-Link Tapo C520WS
High 7.1
In plain English
A high-severity heap buffer overflow in Tapo C520WS v2.6 from TP-Link Systems Inc.. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 15% of all known vulnerabilities).
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| TP-Link Systems Inc. | Tapo C520WS v2.6 | 0 – before 1.2.4 Build 260326 Rel.24666n |
Weakness: CWE-122 · Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N