CVE-2026-34120 | TP-Link Tapo C520WS 2.6 heap-based overflow (EUVD-2026-18430)

VDB-354969 · CVE-2026-34120 · EUVD-2026-18430 TP-LINK TAPO C520WS 2.6 HEAP-BASED OVERFLOW HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 8.0 $0-$5k 1.53+ 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 04/02/2026). 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). Productinfo Vendor TP-Link Name Tapo C520WS Version 2.6 License commercial Website Vendor: https://www.tp-link.com/ CPE 2.3info 🔒 CPE 2.2info 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA CVSS-B Score: 🔒 CNA CVSS-BT Score: 🔒 CNA Vector: 🔒 CVSSv3info VulDB Meta Base Score: 8.0 VulDB Meta Temp Score: 8.0 VulDB Base Score: 8.0 VulDB Temp Score: 8.0 VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Heap-based overflow CWE: CWE-122 / CWE-119 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Partially Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: no mitigation known Status: 🔍 0-Day Time: 🔒 Timelineinfo 03/25/2026 CVE reserved 04/02/2026 +7 days Advisory disclosed 04/02/2026 +0 days VulDB entry created 04/02/2026 +0 days VulDB entry last update Sourcesinfo Vendor: tp-link.com Advisory: tp-link.com Status: Not defined CVE: CVE-2026-34120 (🔒) GCVE (CVE): GCVE-0-2026-34120 GCVE (VulDB): GCVE-100-354969 EUVD: 🔒 Entryinfo Created: 04/02/2026 19:39 Updated: 04/02/2026 21:15 Changes: 04/02/2026 19:39 (64), 04/02/2026 21:15 (1) Complete: 🔍 Cache ID: 99:C02:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸