CVE-2026-71243 backmeup (npm) - OS Command Injection via Backup Option Values
Attackers can execute arbitrary OS commands by injecting malicious characters into backup option values in the backmeup npm package.
- 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-2026-71243?
CVE-2026-71243 is a high-severity command injection vulnerability in adaltas backmeup, published on 5 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The backmeup npm package assembles shell command strings by directly concatenating its option values (name, source, destination, filter) - e.g. cmd = "mkdir -p " + path.join(info.destination, info.name) + "; " - and executes the resulting string through a shell via ssh2-exec (locally via child_process, or remotely via SSH when an ssh handle is supplied), rather than using execFile/spawn with an argument array.
Weakness: CWE-78
Which versions are affected by CVE-2026-71243?
How do I fix CVE-2026-71243?
No fix has been published for CVE-2026-71243 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-2026-71243 being exploited?
There is no known exploitation of CVE-2026-71243 in the wild and no public exploit code.
Sources
Also known as GHSA-c6xg-rfqh-85cp.