Amazon Linux 2023 Security Advisory: ALAS2023-2026-2116
Advisory Released Date: 2026-08-31
Advisory Updated Date: 2026-08-31
FAQs regarding Amazon Linux ALAS/CVE Severity
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 as a result of 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 integer overflow. 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-2026-20339)
A vulnerability in the GPT file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition or possibly other expanded impacts as a result of memory corruption on an affected device.
This vulnerability is due to improper handling of an endian conversion operation, which may result in an out-of-bounds buffer write. An attacker could exploit this vulnerability by submitting a crafted GPT file 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-2026-20345)
A vulnerability in the PDF file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition or possibly other expanded impacts as a result of memory corruption on an affected device.
This vulnerability is due to improper boundary checks for content in PDF files during scanning, which may result in an out-of-bounds buffer read. An attacker could exploit this vulnerability by submitting a crafted PDF file 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-2026-20346)
A vulnerability in the Mach-O file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition or possibly other expanded impacts as a result of memory corruption on an affected device.
This vulnerability is due to improper boundary checks for content in Mach-O files during scanning, which may result in an out-of-bounds buffer read. An attacker could exploit this vulnerability by submitting a crafted Mach-O file 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-2026-20347)
A vulnerability in the XAR file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition or possibly other expanded impacts as a result of memory corruption on an affected device.
This vulnerability is due to improper boundary checks for content in XAR files during scanning. An attacker could exploit this vulnerability by submitting a crafted file that contains XAR 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-2026-20348)
Affected Packages:
clamav1.5
Issue Correction:
Run dnf update clamav1.5 --releasever 2023.12.20260831 or dnf update --advisory ALAS2023-2026-2116 --releasever 2023.12.20260831 to update your system.
More information on how to update your system can be found on this page: Amazon Linux 2023 documentation
aarch64:
clamd1.5-debuginfo-1.5.4-1.amzn2023.0.1.aarch64
clamav1.5-milter-debuginfo-1.5.4-1.amzn2023.0.1.aarch64
clamav1.5-freshclam-debuginfo-1.5.4-1.amzn2023.0.1.aarch64
clamav1.5-milter-1.5.4-1.amzn2023.0.1.aarch64
clamd1.5-1.5.4-1.amzn2023.0.1.aarch64
clamav1.5-1.5.4-1.amzn2023.0.1.aarch64
clamav1.5-devel-1.5.4-1.amzn2023.0.1.aarch64
clamav1.5-lib-debuginfo-1.5.4-1.amzn2023.0.1.aarch64
clamav1.5-freshclam-1.5.4-1.amzn2023.0.1.aarch64
clamav1.5-debuginfo-1.5.4-1.amzn2023.0.1.aarch64
clamav1.5-lib-1.5.4-1.amzn2023.0.1.aarch64
clamav1.5-debugsource-1.5.4-1.amzn2023.0.1.aarch64
noarch:
clamav1.5-filesystem-1.5.4-1.amzn2023.0.1.noarch
clamav1.5-doc-1.5.4-1.amzn2023.0.1.noarch
clamav1.5-data-1.5.4-1.amzn2023.0.1.noarch
src:
clamav1.5-1.5.4-1.amzn2023.0.1.src
x86_64:
clamav1.5-debuginfo-1.5.4-1.amzn2023.0.1.x86_64
clamd1.5-debuginfo-1.5.4-1.amzn2023.0.1.x86_64
clamav1.5-devel-1.5.4-1.amzn2023.0.1.x86_64
clamav1.5-milter-debuginfo-1.5.4-1.amzn2023.0.1.x86_64
clamd1.5-1.5.4-1.amzn2023.0.1.x86_64
clamav1.5-lib-debuginfo-1.5.4-1.amzn2023.0.1.x86_64
clamav1.5-1.5.4-1.amzn2023.0.1.x86_64
clamav1.5-freshclam-debuginfo-1.5.4-1.amzn2023.0.1.x86_64
clamav1.5-milter-1.5.4-1.amzn2023.0.1.x86_64
clamav1.5-freshclam-1.5.4-1.amzn2023.0.1.x86_64
clamav1.5-lib-1.5.4-1.amzn2023.0.1.x86_64
clamav1.5-debugsource-1.5.4-1.amzn2023.0.1.x86_64