CVE-2012-6706: RARLAB UnRAR

Critical severity, CVSS 9.8. EPSS: 10% chance of exploitation in the next 30 days.

A VMSF_DELTA memory corruption was discovered in unrar before 5.5.5, as used in Sophos Anti-Virus Threat Detection Engine before 3.37.2 and other products, that can lead to arbitrary code execution. An integer overflow can be caused in DataSize+CurChannel. The result is a negative value of the "DestPos" variable, which allows the attacker to write out of bounds when setting Mem[DestPos].

Affected products

• RARLAB UnRAR: up to and including 5.5.4
• Sophos Threat Detection Engine: up to and including 3.36.2

Published 2017-06-22. Last modified 2026-06-16.