CVE-2026-76861 Netcore NR255-V 1.5.130703 Stack-Based Buffer Overflow in ntools_tcpdump_start_set.cgi
An attacker can execute arbitrary code on Netcore NR255-V routers by exploiting a stack-based buffer overflow in a CGI endpoint.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-76861?
CVE-2026-76861 is a high-severity memory corruption vulnerability in Netcore NR255-V, published on 15 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Netcore NR255-V version 1.5.130703 contains a stack-based buffer overflow in ntools_tcpdump_start_set.cgi caused by an unsized sprintf call when processing form values. An attacker can submit crafted input to this cgi endpoint to overflow the stack buffer and potentially execute arbitrary code.
Weakness: CWE-121
Which versions are affected by CVE-2026-76861?
How do I fix CVE-2026-76861?
No fix has been published for CVE-2026-76861 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-76861 being exploited?
There is no known exploitation of CVE-2026-76861 in the wild and no public exploit code.
Sources
Also known as GHSA-hj8p-w4gv-7pjf.