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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.37%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 4.0
- 7.1 HIGHCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 0.37% probability · 30th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-122
- Affected
- tp-link/tapo c520ws firmware
- Source
- f23511db-6c3e-4e32-a477-6aa17d310630
References
- 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-NotesRelease 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-NotesRelease Notes
- https://www.tp-link.com/us/support/faq/5047/Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.