CVE-2026-18588

Critical

Description

A vulnerability has been found in Wavlink WL-NU516U1 708c073-mt7628. This affects the function fgets of the file nas.cgi. The manipulation of the argument CONTENT_LENGTH leads to stack-based buffer overflow. Remote exploitation of the attack is possible. You should upgrade the affected component. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.

SeverityCritical

CVSS9.8

Exploit probability—

ProductWavlink Wl-nu516u1 Firmware

PublishedAug 3, 2026

First seenAug 3, 2026

Weakness typeCWE-121CWE-121 CWE-119Memory buffer bounds error

How to fix

Patches

dl.wavlink.com/firmware/RD/WINSTAR_NU516U1-WO-A-2026-07-13-4b8a21f-mt7628-squashfs-sysupgrade.bin

Affected products

Product	Affected versions	Fixed in
wavlink wl-nu516u1_firmware	708c073-mt7628	—

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