CVE-2026-38821
A heap-based buffer overflow vulnerability exists in openNDS before 11.0.0 that allows an unauthenticated attacker on the captive portal network to crash the openNDS daemon (denial of service) and potentially achieve remote code execution. This is in http_microhttpd.c.
- Published Aug 28, 2026
- CVSS 7.1 high
- 0.3% chance of exploitation in the next 30 days (EPSS)
- A fix is available