It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1956 advisory.

    A vulnerability in the PE 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 PE 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 PE 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. (CVE-2026-20213)

    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. (CVE-2026-20214)

    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 7zcontent 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. (CVE-2026-20215)

    A vulnerability in the InstallShield file format parser of ClamAV could allow an unauthenticated, remote     attacker to cause a DoS condition on an affected device.This vulnerability is due to improper handling of     temporary resources during file scanning. An attacker could exploit this vulnerability by submitting a     crafted InstallShield file to be scanned by ClamAV on an affected device. A successful exploit could allow     the attacker to terminate the ClamAV scanning process and temporarily consume available system resources,     resulting in a DoS condition on the affected software. (CVE-2026-20216)

    A vulnerability in the PESpin 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 PESpin 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 PESpin 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. (CVE-2026-20217)

    A vulnerability in the ALZ 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 ALZ 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 ALZ 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. (CVE-2026-20243)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Detections

Analytics

Amazon Linux 2023 : clamav1.4, clamav1.4-data, clamav1.4-devel (ALAS2023-2026-1956)

high Nessus Plugin ID 328497

Version 1.2

Version 1.1

Version 1.2 Aug 24, 2026, 3:52 PM CVSS temporal metrics ("CVSSv2 temporal vector" set to "CVSS2#E:POC/RL:OF/RC:C") CVSS temporal metrics ("CVSSv3 temporal vector" set to "CVSS:3.0/E:P/RL:O/RC:C") Exploit attributes ("Exploit available" set to "True") Exploit attributes ("Exploitability ease" changed from "No known exploits are available" to "Exploits are available") Plugin Feed: 202608241552
Version 1.1 Jul 21, 2026, 8:31 PM New Plugin Feed: 202607212031