TP-Link Tapo C520WS 2.6 HTTP Parser heap-based overflow

Summaryinfo

A vulnerability, which was classified as critical, was found in TP-Link Tapo C520WS 2.6. Affected is an unknown function of the component HTTP Parser. Executing a manipulation can lead to heap-based overflow. This vulnerability appears as CVE-2026-34119. The attacker needs to be present on the local network. There is no available exploit.

Detailsinfo

A vulnerability was found in TP-Link Tapo C520WS 2.6. It has been declared as critical. This vulnerability affects some unknown functionality of the component HTTP Parser. The manipulation with an unknown input leads to a heap-based overflow vulnerability. The CWE definition for the vulnerability is 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(). As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

A heap-based buffer overflow vulnerability was identified in TP-Link Tapo C520WS v2.6 within the HTTP parsing loop when appending segmented request bodies without continuous write‑boundary verification, 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.

The advisory is available at tp-link.com. This vulnerability was named CVE-2026-34119 since 03/25/2026. The exploitation appears to be easy. The attack can only be initiated within the local network. No form of authentication is required for a successful exploitation. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 04/02/2026).

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

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Productinfo

Vendor

• TP-Link

Name

• Tapo C520WS

Version

• 2.6

License

• commercial

Website

• Vendor: https://www.tp-link.com/

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