Integer underflow in ClamAV - CVE-2026-20214
Published: July 1, 2026
Vulnerability identifier: #VU136662
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-2026-20214
CWE-ID: CWE-191
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 underflow in the FSG unpacker loop when scanning a malformed PE file. A remote attacker can provide a specially crafted file to execute arbitrary code.
The issue can write past the section array.
How to mitigate CVE-2026-20214
Install security update from vendor's website.