# CVE-2026-101074: Netcore NR289-GE stack buffer overflow in boa

Source: https://junglewise.ai/threats/cve-2026-101074-a-weakness-has-been-identified-in-netcore-nr289-ge-1-4-5102-the  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-28. Updated: 2026-09-28  
License: CC BY 4.0 with a link back

CVE-2026-101074 · Severity: critical · CVSS 9.8 · Published 2026-09-28

Netcore NR289-GE is an SMB router with web-based management. An unauthenticated attacker can trigger a stack buffer overflow in the web server's authentication handler by sending a malformed username, crashing the management interface or potentially executing arbitrary code as root. The vulnerability requires no credentials and can be exploited with a single network request.

Technologies: [Netcore NR289-GE](https://junglewise.ai/threats/technologies/nr289-ge). Vendors: [Netcore](https://junglewise.ai/threats/vendors/netcore).

## Quick answers

**Is CVE-2026-101074 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-101074 being exploited in the wild.

**How severe is CVE-2026-101074?** Critical severity, with a CVSS score of 9.8, published 28 September 2026.

**Which products and versions are affected?** Netcore NR289-GE 1.4.5102.

**Is there a fix for CVE-2026-101074?** 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-2026-101074 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-101074?** Check whether you run Netcore NR289-GE 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 boa web server's password-check function in /bin/boa uses strcpy to copy the decoded username from an HTTP Basic Authorization header into two 64-byte stack buffers without bounds checking. An attacker can craft a username exceeding 96 bytes to overflow and overwrite the saved return address and register values on the stack, achieving deterministic program counter control. The vulnerability is pre-authentication and exploitable remotely via a single HTTP GET request.

## Affected products

- Netcore NR289-GE 1.4.5102

## Timeline

- 2026-09-28: disclosed

## References

- [https://github.com/senxitoyshuyi-ui/HACKALL/blob/main/netcore_NR289-GE_V1.4.5102%2C2018.06.1418_44%20Router/Netcore_NR289-GE_boa_stack_overflow.md](https://github.com/senxitoyshuyi-ui/HACKALL/blob/main/netcore_NR289-GE_V1.4.5102%2C2018.06.1418_44%20Router/Netcore_NR289-GE_boa_stack_overflow.md)
- [https://vuldb.com/cve/CVE-2026-101074](https://vuldb.com/cve/CVE-2026-101074)

## Related threats

- [Netcore NR289-GE authentication bypass in boa web server](https://junglewise.ai/threats/cve-2026-101077-a-flaw-has-been-found-in-netcore-nr289-ge-1-4-5102-this-impacts)
- [Netcore NR289-GE OS command injection in NTP handler](https://junglewise.ai/threats/cve-2026-101076-a-vulnerability-was-detected-in-netcore-nr289-ge-1-4-5102-this)
- [Netcore NR289-GE OS command injection in location_time.cgi](https://junglewise.ai/threats/cve-2026-101075-a-security-vulnerability-has-been-detected-in-netcore-nr289-ge-1)
- [Netcore NR289-GE authentication bypass in CGI dispatcher](https://junglewise.ai/threats/cve-2026-101073-a-security-flaw-has-been-discovered-in-netcore-nr289-ge-1-4-5102)
- [Netcore NR289-GE OS command injection in CGI handler](https://junglewise.ai/threats/cve-2026-101072-a-vulnerability-was-identified-in-netcore-nr289-ge-1-4-5102-this)