CVE-2026-34122 | TP-Link Tapo C520WS 2.6 Configuration Parameter stack-based overflow (EUVD-2026-18434)

VDB-354964 · CVE-2026-34122 · EUVD-2026-18434 TP-LINK TAPO C520WS 2.6 CONFIGURATION PARAMETER STACK-BASED OVERFLOW HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 8.8 $0-$5k 1.36+ Summaryinfo A vulnerability categorized as critical has been discovered in TP-Link Tapo C520WS 2.6. Impacted is an unknown function of the component Configuration Parameter Handler. Executing a manipulation can lead to stack-based overflow. The identification of this vulnerability is CVE-2026-34122. The attack needs to be done within the local network. There is no exploit available. Detailsinfo A vulnerability has been found in TP-Link Tapo C520WS 2.6 and classified as critical. This vulnerability affects an unknown functionality of the component Configuration Parameter Handler. The manipulation with an unknown input leads to a stack-based overflow vulnerability. The CWE definition for the vulnerability is CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes: A stack-based buffer overflow vulnerability was identified in TP-Link Tapo C520WS v2.6 within a configuration handling component due to insufficient input validation. An attacker can exploit this vulnerability by supplying an excessively long value for a vulnerable configuration parameter, resulting in a stack overflow. Successful exploitation results in Denial-of-Service (DoS) condition, leading to a service crash or device reboot, impacting availability. The advisory is shared for download at tp-link.com. This vulnerability was named CVE-2026-34122 since 03/25/2026. The exploitation appears to be easy. The attack can only be done within the local network. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (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-2026-18434). 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: 8.8 VulDB Meta Temp Score: 8.8 VulDB Base Score: 8.8 VulDB Temp Score: 8.8 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: Stack-based overflow CWE: CWE-121 / 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-2026-34122 (🔒) GCVE (CVE): GCVE-0-2026-34122 GCVE (VulDB): GCVE-100-354964 EUVD: 🔒 Entryinfo Created: 04/02/2026 19:38 Updated: 04/02/2026 21:15 Changes: 04/02/2026 19:38 (65), 04/02/2026 21:15 (1) Complete: 🔍 Cache ID: 99:CC1:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸