Read the docs
TI-2026-26441 Aliases CVE-2026-34119GHSA-25v3-gpg9-m4p7

Heap-based Buffer Overflow Vulnerability Leading to Denial-of-Service in TP-Link Tapo C520WS

Priority LOW 31CWE-122Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-122 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00239 15th percentileScored 2026-11-07
Fix Fixed Tapo C520WS v2.6 (TP-Link Systems Inc.): 1.2.4 Build 260326 Rel.24666n

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
TP-LinkTapo C520WS v2.6before 1.2.4 Build 260326 Rel.24666n1.2.4 Build 260326 Rel.24666nPatch availableCNA
  • Tapo C520WS v2.6 VendorTP-Link Affected before 1.2.4 Build 260326 Rel.24666n Fixed in 1.2.4 Build 260326 Rel.24666n Patch available CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:o:tp-link:tapo_c520ws_firmware:*:*:*:*:*:*:*:*before 1.2.4VulnerableTP-Link
cpe:2.3:h:tp-link:tapo_c520ws:2.6:*:*:*:*:*:*:*2.6Running onTP-Link
  • cpe:2.3:o:tp-link:tapo_c520ws_firmware:*:*:*:*:*:*:*:* Versions before 1.2.4 Vulnerable ·TP-Link
  • cpe:2.3:h:tp-link:tapo_c520ws:2.6:*:*:*:*:*:*:* Versions 2.6 Running on ·TP-Link

Remediation

  • Fix · CNA Tapo C520WS v2.6 (TP-Link Systems Inc.) Fixed in 1.2.4 Build 260326 Rel.24666n

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Advisory ·

    TP-Link Systems Tapo C520WS v2.6 — tp-link.com/us/support/faq/5047

    6 records Highest priority Priority MEDIUM 1 MEDIUM, 5 LOW

    Other records, highest priority first

    • TI-2026-26443 Authentication Bypass in DS Configuration Service via HTTP Request Parsing Differential of TP-Link Tapo C520WS and C210Priority MEDIUM 40
    • TI-2026-26440 Heap-based Buffer Overflow Vulnerability Leading to Denial-of-Service in multiple TP-Link Tapo CamerasPriority LOW 32
    • TI-2026-26446 Denial of Service via Path Expansion Overflow in HTTP Service in TP-Link Tapo C520WSPriority LOW 31
    Show all 6 records → Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-34119
  2. 2026-10-03 Alias added: GHSA-25v3-gpg9-m4p7

References

Patch 2

Advisory 1

  • TI-2026-26443 Authentication Bypass in DS Configuration Service via HTTP Request Parsing Differential of TP-Link Tapo C520WS and C210 CVSS 4.0HIGH 8.7
  • TI-2026-26440 Heap-based Buffer Overflow Vulnerability Leading to Denial-of-Service in multiple TP-Link Tapo Cameras CVSS 4.0HIGH 7.1
  • TI-2026-01028 Unauthenticated Denial of Service via Firmware Update Endpoint on TP-Link Tapo C220 & C520WS CVSS 4.0HIGH 7.1
  • TI-2026-00695 Unauthenticated Denial of Service via Oversized URL in HTTP Parser on TP-Link Tapo C210, C220 & C520WS CVSS 4.0HIGH 7.1
  • TI-2026-00694 Null Pointer Dereference in Tapo SmartCam HTTP Service on TP-Link Tapo C220 & C520WS CVSS 4.0HIGH 7.1
  • TI-2026-26446 Denial of Service via Path Expansion Overflow in HTTP Service in TP-Link Tapo C520WS CVSS 4.0HIGH 7.1
See all 9 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences