CVE-2026-18589: Wavlink WL-NU516U1 nas.cgi change_password stack-based overflow

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-03 · updated 2026-10-23
Weakness: CWE-119

Description

A vulnerability was found in Wavlink WL-NU516U1 708c073-mt7628. This impacts the function change_password of the file nas.cgi. The manipulation of the argument User1Passwd results in stack-based buffer overflow. The attack can be executed remotely. The exploit has been made public and could be used. The affected component should be upgraded. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.

Affected products

Wavlink NU516U1: 708c073-mt7628

References

https://dl.wavlink.com/firmware/RD/WINSTAR_NU516U1-WO-A-2026-07-13-4b8a21f-mt7628-squashfs-sysupgrade.bin
https://github.com/oduoke567/WAVLINK-NU516U1-2026-05-1/blob/main/report2.md
https://vuldb.com/cve/CVE-2026-18589
https://vuldb.com/submit/850501
https://vuldb.com/vuln/385417
https://vuldb.com/vuln/385417/cti

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