CVE-2026-74843 | Wavlink WN531P3/WN535M1 V250922 Export Pingortrace CGI export_pingortrace.cgi strcpy HTTP_COOKIE stack-based overflow

A vulnerability, which was classified as very critical, was found 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 identification of this vulnerability is CVE-2026-74843. The attack may be launched remotely. Furthermore, there is an exploit available.

The vendor was contacted early about this disclosure.