CVE-2026-20214
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk37th percentile — higher than 37% of all known CVEs
Summary
A vulnerability in the FSG file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition or other impacts due to memory corruption. The issue stems from improper boundary checks during FSG file scanning, leading to an out-of-bounds buffer write.
Risk Assessment
An attacker can submit a crafted file with FSG-compressed PE content, causing the ClamAV scanning process to terminate and disrupting threat detection, which exposes the organization to malware attacks.
Recommendation
Update ClamAV immediately to the latest version containing the fix for CVE-2026-20214. Until the update is applied, consider restricting FSG file scanning or deploying temporary IPS/IDS rules.
Original NVD description (English source)
A vulnerability in the FSG file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition, or possibly other expanded impacts, resulting from memory corruption on an affected device. This vulnerability is due to improper boundary checks for content in FSG files during scanning, which may result in an out-of-bounds buffer write. An attacker could exploit this vulnerability by submitting a crafted file that contains portable executable content compressed with FSG to be scanned by ClamAV on an affected device. A successful exploit could allow the attacker to cause the ClamAV scanning process to terminate, resulting in a DoS condition on the affected software.