Quick answers
- Is CVE-2026-9426 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-9426 being exploited in the wild.
- How severe is CVE-2026-9426?
- High severity, with a CVSS score of 8.8, published 25 May 2026.
- Which products and versions are affected?
- Edimax EW-7438RPn 1.31.
- Is there a fix for CVE-2026-9426?
- 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-2026-9426 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-9426?
- 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 vulnerability exists in the 'webs' binary of the Edimax EW-7438RPn Wi-Fi extender (firmware version 1.31). The flaw is located within the 'formHwSet' function in the '/goform/formHwSet' handler. The function fails to validate the length of several input parameters, including 'Anntena', 'Mcs', 'regDomain', and others, before copying them into a fixed-size stack buffer. A remote attacker with low privileges (authenticated) can exploit this by sending a POST request with excessively long strings, overwriting the return address to achieve arbitrary code execution or a device crash (DoS). As of the advisory date, the vendor has not responded to disclosure attempts, and no patch is available.
Affected products
- Edimax EW-7438RPn 1.31
Timeline
- 2026-05-25: disclosed: Public disclosure of the vulnerability and PoC.
- 2026-05-25: advisory: CVE-2026-9426 published.