CVE-2026-18588

CRITICAL 9.8

Wavlink WL-NU516U1 nas.cgi fgets stack-based overflow

CVSS Score

9.8

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-121 CWE-119
Vendor	wavlink
Product	wl-nu516u1
Published	Aug 3, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:X/RL:O/RC:C

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

Affected Versions

Wavlink / WL-NU516U1

708c073-mt7628

References

NVD ↗ CVE.org ↗ EPSS Data ↗

vuldb.com: https://vuldb.com/vuln/385416 vuldb.com: https://vuldb.com/vuln/385416/cti vuldb.com: https://vuldb.com/cve/CVE-2026-18588 vuldb.com: https://vuldb.com/submit/850500 github.com: https://github.com/oduoke567/WAVLINK-NU516U1-2026-05-1/blob/main/report2.md dl.wavlink.com: https://dl.wavlink.com/firmware/RD/WINSTAR_NU516U1-WO-A-2026-07-13-4b8a21f-mt7628-squashfs-sysupgrade.bin

Credits

🔍 oduoke (VulDB User) VulDB CNA Team