CVE-2026-38820 Command injection in openNDS
Unauthenticated attackers can execute arbitrary OS commands via shell injection in the openNDS captive portal service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-38820?
CVE-2026-38820 is a high-severity command injection vulnerability in openNDS, published on 28 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
openNDS before 11.0.0 is susceptible to unauthenticated OS command execution via shell command injection through the fas query parameter on the /opennds_preauth/ endpoint because of libopennds.sh.
Weakness: CWE-78
Which versions are affected by CVE-2026-38820?
How do I fix CVE-2026-38820?
No fix has been published for CVE-2026-38820 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-38820 being exploited?
There is no known exploitation of CVE-2026-38820 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-38820, GHSA-hw32-3v67-92pf, UBUNTU-CVE-2026-38820.