TP-Link Tapo C520WS 2.6 heap-based overflow

Summaryinfo

A vulnerability has been found in TP-Link Tapo C520WS 2.6 and classified as critical. Affected by this vulnerability is an unknown functionality. The manipulation leads to heap-based overflow. This vulnerability is traded as CVE-2026-34118. Access to the local network is required for this attack to succeed. There is no exploit available.

Detailsinfo

A vulnerability was found in TP-Link Tapo C520WS 2.6. It has been rated as critical. This issue affects an unknown part. The manipulation with an unknown input leads to a heap-based overflow vulnerability. Using CWE to declare the problem leads to 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(). Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at tp-link.com. The identification of this vulnerability is CVE-2026-34118 since 03/25/2026. The exploitation is known to be easy. The attack needs to be done within the local network. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available. The pricing 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-2026-18426). Be aware that VulDB is the high quality source for 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

Be aware that VulDB is the high quality source for vulnerability data.

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