CVE-2026-34118

A heap-based buffer overflow vulnerability was identified in TP-Link Tapo C100/C101 v5, 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.

CVSS v3 6.5 MEDIUM

6.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 3.6

Attack Vector ADJACENT_NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://www.tp-link.com/en/support/download/tapo-c100/v5/#Firmware-Release-Notes
https://www.tp-link.com/en/support/download/tapo-c520ws/#Firmware-Release-Notes	Release Notes
https://www.tp-link.com/us/support/download/tapo-c100/v5/#Firmware-Release-Notes
https://www.tp-link.com/us/support/download/tapo-c101/v5/#Firmware-Release-Notes
https://www.tp-link.com/us/support/download/tapo-c520ws/#Firmware-Release-Notes	Release Notes
https://www.tp-link.com/us/support/faq/5047/	Vendor Advisory

Configurations

Configuration 1 (hide)

AND

cpe:2.3:o:tp-link:tapo_c520ws_firmware:*:*:*:*:*:*:*:*

cpe:2.3:h:tp-link:tapo_c520ws:2.6:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-04-02 18:16

Updated : 2026-08-19 19:17

NVD link : CVE-2026-34118

Mitre link : CVE-2026-34118

CVE.ORG link : CVE-2026-34118

JSON object : View

Products Affected

tp-link

tapo_c520ws
tapo_c520ws_firmware

CWE

CWE-122

Heap-based Buffer Overflow

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La explotaci\u00f3n exitosa causa una condici\u00f3n de Denegaci\u00f3n de Servicio (DoS), haciendo que el proceso del dispositivo se bloquee o deje de responder."}], "lastModified": "2026-08-19T19:17:16.280", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:tp-link:tapo_c520ws_firmware:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "710DD89A-E94F-4371-A03F-698C2F61D9C1", "versionEndExcluding": "1.2.4"}], "operator": "OR"}, {"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:h:tp-link:tapo_c520ws:2.6:*:*:*:*:*:*:*", "vulnerable": false, "matchCriteriaId": "72666951-E72F-4494-9A90-1F0B22E2F3CD"}], "operator": "OR"}], "operator": "AND"}], "sourceIdentifier": "f23511db-6c3e-4e32-a477-6aa17d310630"}