An OS command injection flaw was found in Less. Since quoting is mishandled in filename.c, opening files with attacker-controlled file names can lead to OS command execution. Exploitation requires the LESSOPEN environment variable, which is set by default in many common cases.
Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.