# CVE-2026-94003: Comfast CF-N1-S stack-based buffer overflow in web management

Source: https://junglewise.ai/threats/cve-2026-94003-a-vulnerability-has-been-found-in-comfast-cf-n1-s-2-6-0-1  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-20. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-94003 · Severity: critical · CVSS 10 · Published 2026-09-20

Comfast's CF-N1-S router contains a stack-based buffer overflow vulnerability in its web management interface that can be exploited remotely without authentication. An attacker can send a specially crafted HTTP request to crash the management service, causing denial of service, or potentially execute arbitrary code on the device.

Technologies: [Comfast CF-N1-S](https://junglewise.ai/threats/technologies/cf-n1-s). Vendors: [Comfast](https://junglewise.ai/threats/vendors/comfast).

## Quick answers

**Is CVE-2026-94003 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-94003 being exploited in the wild.

**How severe is CVE-2026-94003?** Critical severity, with a CVSS score of 10, published 20 September 2026.

**Which products and versions are affected?** Comfast CF-N1-S 2.6.0.1.

**Is there a fix for CVE-2026-94003?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-94003 attacked?** It is attacked over the network, in device firmware.

**Am I affected by CVE-2026-94003?** Check whether you run Comfast CF-N1-S at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The get_css_path_from_uri function in /cgi-bin/mbox-config fails to validate input length when copying URI path data into a fixed-size stack buffer, allowing a remote attacker to overflow the buffer without credentials. The vulnerable endpoint does not enforce login session validation, and the function uses only a "?" character or string terminator as a stop condition, enabling stack memory corruption including local variables, saved registers, and return addresses.

## Affected products

- Comfast CF-N1-S 2.6.0.1

## Timeline

- 2026-08-24: disclosed
- 2026-09-20: advisory

## References

- [https://github.com/AdminSafe/CVE/issues/12](https://github.com/AdminSafe/CVE/issues/12)
- [https://vuldb.com/cve/CVE-2026-94003](https://vuldb.com/cve/CVE-2026-94003)

## Related threats

- [Comfast CF-N1-S command injection in webmgnt](https://junglewise.ai/threats/cve-2026-75364-comfast-cf-n1-s-command-injection-in-webmgnt)
- [Comfast CF-N1-S stack buffer overflow in NTP timezone configuration](https://junglewise.ai/threats/cve-2026-78050-comfast-cf-n1-s-stack-buffer-overflow-in-ntp-timezone)
- [Comfast CF-N1-S command injection in NTP timezone](https://junglewise.ai/threats/cve-2026-77683-comfast-cf-n1-s-command-injection-in-ntp-timezone)
- [Comfast CF-N1-S stack-based buffer overflow in web management](https://junglewise.ai/threats/cve-2026-77148-comfast-cf-n1-s-stack-based-buffer-overflow-in-web-management)
- [Comfast CF-N1-S stack-based buffer overflow in SSID configuration](https://junglewise.ai/threats/cve-2026-77022-comfast-cf-n1-s-stack-based-buffer-overflow-in-ssid-configuration)