CVE-2026-34118
MediumCVSS 6.5Exploitation Probability (EPSS)
Low risk18th percentile - higher than 18% of all known CVEs
Summary
In TP-Link Tapo C520WS v2.6, a heap-based buffer overflow vulnerability was identified in the HTTP POST body parsing logic due to missing validation of remaining buffer capacity after dynamic allocation. An attacker on the same network segment can trigger heap memory corruption by sending crafted payloads, causing write operations beyond allocated buffer boundaries. Successful exploitation leads to a Denial-of-Service (DoS) condition, causing the device process to crash or become unresponsive.
Risk Assessment
An attacker on the same network can cause device crash or unresponsiveness, leading to monitoring disruption and availability loss.
Recommendation
Update the TP-Link Tapo C520WS firmware to the latest version if available, and restrict HTTP interface access to trusted networks only.
Original NVD description (English source)
A heap-based buffer overflow vulnerability was identified in TP-Link Tapo C520WS v2.6 in the HTTP POST body parsing logic due to missing validation of remaining buffer capacity after dynamic allocation, due to insufficient boundary validation when handling externally supplied HTTP input. 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.