F-Secure has patched several vulnerabilities in its security products, the most critical of which could be used to run unauthorized software on a victim’s computer.

The most critical of these bugs affects F-Secure’s anti-virus products. A flaw in the way the software unpacks files that have been compressed using the LHA archiving format could allow an attacker to crash the system, or even run unauthorized software on the computer, F-Secure said in an advisory, published Wednesday.