CVE-2026-74843 Wavlink WN531P3/WN535M1 Export Pingortrace CGI export_pingortrace.cgi strcpy stack-based overflow
Remote attackers can trigger a stack-based buffer overflow in the export_pingortrace.cgi component via the HTTP_COOKIE argument, potentially leading to code execution or denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-74843?
CVE-2026-74843 is a critical memory corruption vulnerability in Wavlink WN531P3, published on 17 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability was determined in Wavlink WN531P3 and WN535M1 V250922. Affected by this vulnerability is the function strcpy of the file /etc/lighttpd/www/cgi-bin/export_pingortrace.cgi of the component Export Pingortrace CGI. Executing a manipulation of the argument HTTP_COOKIE can lead to stack-based buffer overflow. The attack may be launched remotely. The exploit has been publicly disclosed and may be utilized. The vendor was contacted early about this disclosure.
Which versions are affected by CVE-2026-74843?
How do I fix CVE-2026-74843?
No fix has been published for CVE-2026-74843 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-74843 being exploited?
There is no known exploitation of CVE-2026-74843 in the wild and no public exploit code.
Sources
Also known as GHSA-p9ff-qq24-ccr6.