TP-Link Tapo C520WS 2.6 heap-based overflow

Summaryinfo

A vulnerability classified as critical has been found in TP-Link Tapo C520WS 2.6. Affected is an unknown function. Performing a manipulation results in heap-based overflow. This vulnerability is cataloged as CVE-2026-34120. The attack must originate from the local network. There is no exploit available.

Detailsinfo

A vulnerability classified as critical has been found in TP-Link Tapo C520WS 2.6. This affects some unknown processing. The manipulation with an unknown input leads to a heap-based overflow vulnerability. CWE is classifying the issue as CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at tp-link.com. This vulnerability is uniquely identified as CVE-2026-34120 since 03/25/2026. The exploitability is told to be easy. Access to the local network is required for this attack to succeed. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/26/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-18430). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• TP-Link

Name

• Tapo C520WS

Version

• 2.6

License

• commercial

Website

• Vendor: https://www.tp-link.com/

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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