CVE-2026-34118— Heap-based Buffer Overflow Vulnerability Leading to Denial-of-Service in TP-Link Tapo C100, C101 & C520WS
Quick assessment
Affected
TP-Link Systems Inc. Tapo C520WS v2.6
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
TP-Link Tapo C520WS是中国普联（TP-Link）公司的一个WiFi摄像头。 TP-Link Tapo C520WS v2.6版本存在安全漏洞，该漏洞源于HTTP POST主体解析逻辑中缺少动态分配后剩余缓冲区容量的验证，可能导致堆内存损坏，进而引发拒绝服务攻击。
Possible ATT&CK Techniques 3 AI
T1059 · Command and Scripting Interpreter T1190 · Exploit Public-Facing Application T1499 · Endpoint Denial of ServiceAffected Version Matrix 3
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| TP Link Systems Inc. | Tapo C100 v5 | < 1.5.4 Build 260528 Rel.11462n |
affected |
| TP Link Systems Inc. | Tapo C101 v5 | < 1.5.4 Build 260528 Rel.11462n |
affected |
| TP-Link Systems Inc. | Tapo C520WS v2.6 | < 1.2.4 Build 260326 Rel.24666n |
affected |
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I. Basic Information for CVE-2026-34118
Vulnerability Information
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Vulnerability Title
Heap-based Buffer Overflow Vulnerability Leading to Denial-of-Service in TP-Link Tapo C100, C101 & C520WS
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
TP-Link Tapo C520WS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
TP-Link Tapo C520WS是中国普联（TP-Link）公司的一个WiFi摄像头。 TP-Link Tapo C520WS v2.6版本存在安全漏洞，该漏洞源于HTTP POST主体解析逻辑中缺少动态分配后剩余缓冲区容量的验证，可能导致堆内存损坏，进而引发拒绝服务攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| TP-Link Systems Inc. | Tapo C520WS v2.6 | 0 ~ 1.2.4 Build 260326 Rel.24666n | - |
|
| TP Link Systems Inc. | Tapo C100 v5 | 0 ~ 1.5.4 Build 260528 Rel.11462n | - |
|
| TP Link Systems Inc. | Tapo C101 v5 | 0 ~ 1.5.4 Build 260528 Rel.11462n | - |
|
II. Public POCs for CVE-2026-34118
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-34118 (1)
Vendor Pages for CVE-2026-34118 (1)
Same Patch Batch · TP-Link Systems Inc. · 2026-04-02 · 6 CVEs total
| CVE-2026-34119 | Heap-based Buffer Overflow Vulnerability Leading to Denial-of-Service in TP-Link Tapo C520 | |
| CVE-2026-34121 | Authentication Bypass in DS Configuration Service via HTTP Request Parsing Differential of | |
| CVE-2026-34124 | Denial of Service via Path Expansion Overflow in HTTP Service in TP-Link Tapo C520WS | |
| CVE-2026-34122 | Stack-based Buffer Overflow Leading to Denial of Service in TP-Link Tapo C520WS | |
| CVE-2026-34120 | Heap-based Buffer Overflow Vulnerability Leading to Denial-of-Service in TP-Link Tapo C520 |
IV. Related Vulnerabilities
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-
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V. Comments for CVE-2026-34118
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