Integer overflow in ClamAV - CVE-2026-20215
Published: July 1, 2026
Vulnerability identifier: #VU136664
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-20215
CWE-ID: CWE-190
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: ClamAV
Affected software:
ClamAV
ClamAV
Detailed vulnerability description
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to integer overflow in the 7z parser substream count handling when parsing a malformed archive. A remote attacker can provide a specially crafted archive to execute arbitrary code.
The issue can under-allocate parser metadata arrays and write past them while reading the archive.
How to mitigate CVE-2026-20215
Install security update from vendor's website.