Vulnerability record · CVE-2026-18588 · published 3 August 2026

CVE-2026-18588: Memory buffer overflow vulnerability

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.

9.3 CVSS 4.0 Critical EPSS 1.1% · top 35.8% CWE-119 · Memory buffer overflowCWE-121 · Stack-based buffer overflow Deferred

9.3CVSS 4.0 base score, v2 10.0

1.1%EPSS exploitation probability, 30 days

NoNot in CISA KEV

0Affected product versions listed by NVD

7References

12 Aug 2026Last modified by NVD

Description

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

Link	Tags
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-2026-18588
https://vuldb.com/submit/850500
https://vuldb.com/vuln/385416
https://vuldb.com/vuln/385416/cti
https://vuldb.com/submit/850500

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Source: NIST National Vulnerability Database (record CVE-2026-18588), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.