CVE-2026-27849 Missing neutralization in Linksys MR9600, Linksys MX4200
Attackers can inject OS commands via TLS-SRP update functionality in Linksys mesh routers, leading to remote code execution.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-27849?
CVE-2026-27849 is a critical command injection vulnerability in Linksys MR9600, published on 25 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Due to missing neutralization of special elements, OS commands can be injected via the update functionality of a TLS-SRP connection, which is normally used for configuring devices inside the mesh network. This issue affects MR9600: 1.0.4.205530; MX4200: 1.0.13.210200.
Weakness: CWE-78
Which versions are affected by CVE-2026-27849?
How do I fix CVE-2026-27849?
No fix has been published for CVE-2026-27849 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-2026-27849 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-27849 exists.
Sources
Also known as GHSA-f2jw-4mh9-f63v.