CVE-2026-20215
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk31th percentile — higher than 31% of all known CVEs
Summary
A vulnerability in the 7z file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition, or possibly other impacts from memory corruption. The issue is due to improper boundary checks for content in 7z files during scanning, which may result in an out-of-bounds buffer write.
Risk Assessment
An attacker could exploit this vulnerability by submitting a crafted 7z file for scanning by ClamAV, potentially causing the scanning process to terminate and resulting in a DoS condition on the affected software.
Recommendation
It is recommended to immediately update ClamAV to the latest version containing the fix for CVE-2026-20215 and monitor vendor advisories.
Original NVD description (English source)
A vulnerability in the 7z 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 7z 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 7z content 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.