Critical severity · published Aug 17, 2026
CVE-2026-74843
Wavlink WN531P3/WN535M1 Export Pingortrace CGI export_pingortrace.cgi strcpy stack-based overflow
10.0
CVSS
1%
EPSS
No
On KEV
Description
A vulnerability was determined in Wavlink WN531P3 and WN535M1 V250922. Affected by this vulnerability is the function strcpy of the file /etc/lighttpd/www/cgi-bin/export_pingortrace.cgi of the component Export Pingortrace CGI. Executing a manipulation of the argument HTTP_COOKIE can lead to stack-based buffer overflow. The attack may be launched remotely. The exploit has been publicly disclosed and may be utilized. The vendor was contacted early about this disclosure.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)1.0% · higher than 64% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
WN
WN531P3 · Wavlink
V250922 · source: vendor
WN
WN535M1 · Wavlink
V250922 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-74843
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-74843
github.com
https://github.com/wcndsb-sketch/WAVLINK_WN535M1-M35M1_V250922-Buffer-Overflow/blob/main/CVE-Report-WAVLINK-WN535M1-RCE.pdf
vuldb.com
https://vuldb.com/cve/CVE-2026-74843
vuldb.com
https://vuldb.com/submit/875331
vuldb.com
https://vuldb.com/vuln/391205
vuldb.com
https://vuldb.com/vuln/391205/cti