CVE-2026-76866 Netcore NR255-V 1.5.130703 OS Command Argument Injection via Unquoted DDNS Parameters
Attackers can inject command arguments via DDNS parameters to execute arbitrary code with root privileges on Netcore NR255-V routers.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-76866?
CVE-2026-76866 is a high-severity command injection vulnerability in Netcore NR255-V, published on 15 Sep 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
Netcore NR255-V firmware version 1.5.130703 builds root-run command lines from unquoted user-supplied DDNS input in DDNSset_cgi.c and related ddns_Proc.c components, enabling os command argument injection. Attackers can exploit the unsanitized parameters to inject additional command arguments executed with root privileges.
Weakness: CWE-88
Which versions are affected by CVE-2026-76866?
How do I fix CVE-2026-76866?
No fix has been published for CVE-2026-76866 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-2026-76866 being exploited?
There is no known exploitation of CVE-2026-76866 in the wild and no public exploit code.
Sources
Also known as GHSA-48c9-xhf8-82q7.