# CVE-2026-9346: Edimax EW-7438RPn buffer overflow in formWirelessTbl

Source: https://junglewise.ai/threats/cve-2026-9346-edimax-ew-7438rpn-buffer-overflow-in-formwirelesstbl  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-24. Updated: 2026-05-26  
License: CC BY 4.0 with a link back

CVE-2026-9346 · Severity: high · CVSS 8.8 · Published 2026-05-24

A security vulnerability exists in the Edimax EW-7438RPn Wi-Fi extender, a device used to expand wireless network coverage. An attacker can exploit this flaw to crash the device or potentially take full control of it by sending a specially crafted web request. This could lead to a total loss of internet connectivity for users relying on the extender and may allow unauthorized access to the local network.

Technologies: [Edimax EW-7438RPn](https://junglewise.ai/threats/technologies/ew-7438rpn). Vendors: [Edimax](https://junglewise.ai/threats/vendors/edimax).

## Quick answers

**Is CVE-2026-9346 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-9346 being exploited in the wild.

**How severe is CVE-2026-9346?** High severity, with a CVSS score of 8.8, published 24 May 2026.

**Which products and versions are affected?** Edimax EW-7438RPn up to 1.31.

**Is there a fix for CVE-2026-9346?** 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-2026-9346 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-9346?** Check whether you run Edimax EW-7438RPn 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 exists in the 'webs' binary of the Edimax EW-7438RPn firmware (up to version 1.31). The vulnerability is located within the 'formWirelessTbl' function in the '/goform/formWirelessTbl' handler. The root cause is the unsafe copying of the 'submit-url' POST parameter into a fixed-size local stack buffer without adequate bounds checking. A remote attacker with low-privileged credentials can exploit this by sending an oversized string in the 'submit-url' argument, allowing them to overwrite the return address and achieve arbitrary code execution or cause a device crash (DoS). Public exploit code (PoC) is available, and the vendor has reportedly not responded to disclosure attempts.

## Affected products

- Edimax EW-7438RPn up to 1.31

## Timeline

- 2026-05-24: advisory: Initial disclosure via VulDB and NVD

## References

- [https://github.com/wudipjq/my_vuln/blob/main/Edimax/vuln_4/4.md](https://github.com/wudipjq/my_vuln/blob/main/Edimax/vuln_4/4.md)
- [https://vuldb.com/submit/811541](https://vuldb.com/submit/811541)
- [https://vuldb.com/submit/813888](https://vuldb.com/submit/813888)
- [https://vuldb.com/vuln/365309](https://vuldb.com/vuln/365309)
- [https://vuldb.com/vuln/365309/cti](https://vuldb.com/vuln/365309/cti)

## Related threats

- [Edimax EW-7438RPn stack overflow in formSDHCP](https://junglewise.ai/threats/cve-2026-9482-edimax-ew-7438rpn-stack-overflow-in-formsdhcp)
- [Edimax EW-7438RPn stack overflow in formStats](https://junglewise.ai/threats/cve-2026-9481-edimax-ew-7438rpn-stack-overflow-in-formstats)
- [Edimax EW-7438RPn stack overflow in formrefresh](https://junglewise.ai/threats/cve-2026-9480-edimax-ew-7438rpn-stack-overflow-in-formrefresh)
- [Edimax EW-7438RPn stack overflow in formLogout](https://junglewise.ai/threats/cve-2026-9479-edimax-ew-7438rpn-stack-overflow-in-formlogout)
- [Edimax EW-7438RPn stack overflow in formLicence](https://junglewise.ai/threats/cve-2026-9463-edimax-ew-7438rpn-stack-overflow-in-formlicence)