# CVE-2026-10126: Edimax BR-6478AC buffer overflow in formQoS

Source: https://junglewise.ai/threats/cve-2026-10126-edimax-br-6478ac-buffer-overflow-in-formqos  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-30. Updated: 2026-05-30  
License: CC BY 4.0 with a link back

CVE-2026-10126 · Severity: high · CVSS 8.8 · Published 2026-05-30

A security vulnerability has been identified in the Edimax BR-6478AC router, a device used to provide wireless internet connectivity. An attacker can exploit this flaw to crash the device or potentially take full control of the router's operations. This could lead to a complete loss of internet access for connected users or allow an attacker to intercept network traffic.

Technologies: [Edimax BR-6478AC](https://junglewise.ai/threats/technologies/br-6478ac). Vendors: [Edimax](https://junglewise.ai/threats/vendors/edimax).

## Quick answers

**Is CVE-2026-10126 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-10126 being exploited in the wild.

**How severe is CVE-2026-10126?** High severity, with a CVSS score of 8.8, published 30 May 2026.

**Which products and versions are affected?** Edimax BR-6478AC 1.23.

**Is there a fix for CVE-2026-10126?** 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-2026-10126 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-10126?** Check whether you run Edimax BR-6478AC 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

A stack-based buffer overflow vulnerability exists in the Edimax BR-6478AC router, specifically within the 'formQoS' function located in the '/goform/formQoS' file. The vulnerability is triggered by insufficient validation of the 'selSSID' argument during a POST request. A remote attacker with low-level authentication can exploit this by providing an overly long string to the affected parameter, leading to memory corruption. This can result in a denial-of-service (DoS) condition or remote code execution (RCE). Public exploit code has been released for this vulnerability.

## Affected products

- Edimax BR-6478AC 1.23

## Timeline

- 2026-05-30: disclosed: Vulnerability disclosed and added to NVD dataset.
- 2026-05-30: advisory

## References

- [https://lavender-bicycle-a5a.notion.site/EDIMAX-BR6478ACV2-formQoS-34b53a41781f804e9ddfe771c426d9b2?source=copy_link](https://lavender-bicycle-a5a.notion.site/EDIMAX-BR6478ACV2-formQoS-34b53a41781f804e9ddfe771c426d9b2?source=copy_link)
- [https://vuldb.com/submit/818454](https://vuldb.com/submit/818454)
- [https://vuldb.com/vuln/367303](https://vuldb.com/vuln/367303)
- [https://vuldb.com/vuln/367303/cti](https://vuldb.com/vuln/367303/cti)

## Related threats

- [Edimax BR-6478AC command injection in formWlbasic](https://junglewise.ai/threats/cve-2026-10166-edimax-br-6478ac-command-injection-in-formwlbasic)
- [Edimax BR-6478AC stack overflow in formWanTcpipSetup](https://junglewise.ai/threats/cve-2026-10165-edimax-br-6478ac-stack-overflow-in-formwantcpipsetup)
- [Edimax BR-6478AC buffer overflow in formUSBFolder](https://junglewise.ai/threats/cve-2026-10164-edimax-br-6478ac-buffer-overflow-in-formusbfolder)
- [Edimax BR-6478AC buffer overflow in formUSBAccount](https://junglewise.ai/threats/cve-2026-10163-edimax-br-6478ac-buffer-overflow-in-formusbaccount)
- [Edimax BR-6478AC command injection in formStaDrvSetup](https://junglewise.ai/threats/cve-2026-10127-edimax-br-6478ac-command-injection-in-formstadrvsetup)