Is CVE-2026-38821 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-38821?

CVE-2026-38821 has a CVSS v3 severity of HIGH (7.1).

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CVE-2026-38821

Description

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.