{"id":"UBUNTU-CVE-2026-124747","details":"A flaw was found in BusyBox. When resuming a download over File Transfer Protocol (FTP), the wget utility fails to verify that the resume offset does not exceed the file size reported by the server, resulting in an integer calculation error. A malicious FTP server or an on-path network attacker can exploit this issue by returning crafted file size metadata, triggering a heap-based buffer overflow with attacker-controlled data. Successful exploitation may allow an attacker to execute arbitrary code or crash the application, resulting in a denial of service (DoS).","modified":"2026-11-12T23:46:20.718338990Z","published":"2026-11-12T00:00:00Z","upstream":["CVE-2026-124747"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-124747"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-124747"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-124747"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2569520"}],"affected":[{"package":{"name":"busybox","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/busybox?arch=source&distro=esm-infra-legacy%2Ftrusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.20.0-8.1ubuntu1","1:1.20.0-9ubuntu1","1:1.20.0-9ubuntu2","1:1.21.0-1ubuntu1","1:1.21.0-1ubuntu1.4","1:1.21.0-1ubuntu1.4+esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"1:1.21.0-1ubuntu1.4+esm1","binary_name":"busybox"},{"binary_version":"1:1.21.0-1ubuntu1.4+esm1","binary_name":"busybox-initramfs"},{"binary_name":"busybox-static","binary_version":"1:1.21.0-1ubuntu1.4+esm1"},{"binary_name":"busybox-syslogd","binary_version":"1:1.21.0-1ubuntu1.4+esm1"},{"binary_name":"udhcpc","binary_version":"1:1.21.0-1ubuntu1.4+esm1"},{"binary_name":"udhcpd","binary_version":"1:1.21.0-1ubuntu1.4+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-124747.json"}},{"package":{"name":"busybox","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/busybox?arch=source&distro=esm-infra%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.22.0-15ubuntu1","1:1.22.0-15ubuntu1.4","1:1.22.0-15ubuntu1.4+esm1","1:1.22.0-15ubuntu1.4+esm2"],"ecosystem_specific":{"binaries":[{"binary_version":"1:1.22.0-15ubuntu1.4+esm2","binary_name":"busybox"},{"binary_version":"1:1.22.0-15ubuntu1.4+esm2","binary_name":"busybox-initramfs"},{"binary_name":"busybox-static","binary_version":"1:1.22.0-15ubuntu1.4+esm2"},{"binary_version":"1:1.22.0-15ubuntu1.4+esm2","binary_name":"busybox-syslogd"},{"binary_version":"1:1.22.0-15ubuntu1.4+esm2","binary_name":"udhcpc"},{"binary_name":"udhcpd","binary_version":"1:1.22.0-15ubuntu1.4+esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-124747.json"}},{"package":{"name":"busybox","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/busybox?arch=source&distro=esm-infra%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.22.0-19ubuntu2","1:1.27.2-1ubuntu3","1:1.27.2-1ubuntu4","1:1.27.2-2ubuntu2","1:1.27.2-2ubuntu3","1:1.27.2-2ubuntu3.1","1:1.27.2-2ubuntu3.2","1:1.27.2-2ubuntu3.3","1:1.27.2-2ubuntu3.4","1:1.27.2-2ubuntu3.4+esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"1:1.27.2-2ubuntu3.4+esm1","binary_name":"busybox"},{"binary_version":"1:1.27.2-2ubuntu3.4+esm1","binary_name":"busybox-initramfs"},{"binary_name":"busybox-static","binary_version":"1:1.27.2-2ubuntu3.4+esm1"},{"binary_name":"busybox-syslogd","binary_version":"1:1.27.2-2ubuntu3.4+esm1"},{"binary_version":"1:1.27.2-2ubuntu3.4+esm1","binary_name":"udhcpc"},{"binary_name":"udhcpd","binary_version":"1:1.27.2-2ubuntu3.4+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-124747.json"}},{"package":{"name":"busybox","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/busybox?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.30.1-4ubuntu4","1:1.30.1-4ubuntu5","1:1.30.1-4ubuntu6","1:1.30.1-4ubuntu6.1","1:1.30.1-4ubuntu6.2","1:1.30.1-4ubuntu6.3","1:1.30.1-4ubuntu6.4","1:1.30.1-4ubuntu6.5"],"ecosystem_specific":{"binaries":[{"binary_version":"1:1.30.1-4ubuntu6.5","binary_name":"busybox"},{"binary_name":"busybox-initramfs","binary_version":"1:1.30.1-4ubuntu6.5"},{"binary_name":"busybox-static","binary_version":"1:1.30.1-4ubuntu6.5"},{"binary_name":"busybox-syslogd","binary_version":"1:1.30.1-4ubuntu6.5"},{"binary_name":"udhcpc","binary_version":"1:1.30.1-4ubuntu6.5"},{"binary_version":"1:1.30.1-4ubuntu6.5","binary_name":"udhcpd"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-124747.json"}},{"package":{"name":"busybox","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/busybox?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:1.30.1-6ubuntu3","1:1.30.1-7ubuntu1","1:1.30.1-7ubuntu2","1:1.30.1-7ubuntu3","1:1.30.1-7ubuntu3.1"],"ecosystem_specific":{"binaries":[{"binary_name":"busybox","binary_version":"1:1.30.1-7ubuntu3.1"},{"binary_name":"busybox-initramfs","binary_version":"1:1.30.1-7ubuntu3.1"},{"binary_name":"busybox-static","binary_version":"1:1.30.1-7ubuntu3.1"},{"binary_version":"1:1.30.1-7ubuntu3.1","binary_name":"busybox-syslogd"},{"binary_version":"1:1.30.1-7ubuntu3.1","binar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