{"id":"UBUNTU-CVE-2026-9538","details":"Archive::Tar versions before 3.10 for Perl allow memory exhaustion via attacker controlled entry size field in tar header. _read_tar() reads each entry's payload with $handle-\u003eread($$data, $block), where $block is derived from the entry's 12-byte size field in the tar header with no upper bound on that value. A crafted header declaring a multi-gigabyte size causes Perl to allocate a scalar of that size.","modified":"2026-09-09T19:45:04.519590337Z","published":"2026-05-26T02:16:00Z","related":["USN-8684-1"],"upstream":["CVE-2026-9538"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-9538"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-9538"},{"type":"REPORT","url":"https://lists.security.metacpan.org/cve-announce/msg/40396448/"},{"type":"REPORT","url":"https://github.com/jib/archive-tar-new/commit/f9af01426038e29d9578825a0cd3626946ab08c7.patch"},{"type":"REPORT","url":"https://metacpan.org/release/BINGOS/Archive-Tar-3.10/changes"},{"type":"REPORT","url":"http://www.openwall.com/lists/oss-security/2026/05/26/4"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8684-1"}],"affected":[{"package":{"name":"perl","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/perl?arch=source&distro=esm-infra-legacy%2Ftrusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.14.2-21build1","5.18.1-4","5.18.1-4build1","5.18.1-5","5.18.2-2","5.18.2-2ubuntu1","5.18.2-2ubuntu1.1","5.18.2-2ubuntu1.3","5.18.2-2ubuntu1.4","5.18.2-2ubuntu1.6","5.18.2-2ubuntu1.7","5.18.2-2ubuntu1.7+esm3","5.18.2-2ubuntu1.7+esm4","5.18.2-2ubuntu1.7+esm5","5.18.2-2ubuntu1.7+esm7","5.18.2-2ubuntu1.7+esm8","5.18.2-2ubuntu1.7+esm9"],"ecosystem_specific":{"binaries":[{"binary_name":"libcgi-fast-perl","binary_version":"5.18.2-2ubuntu1.7+esm9"},{"binary_name":"libperl5.18","binary_version":"5.18.2-2ubuntu1.7+esm9"},{"binary_name":"perl","binary_version":"5.18.2-2ubuntu1.7+esm9"},{"binary_name":"perl-base","binary_version":"5.18.2-2ubuntu1.7+esm9"},{"binary_name":"perl-debug","binary_version":"5.18.2-2ubuntu1.7+esm9"},{"binary_version":"5.18.2-2ubuntu1.7+esm9","binary_name":"perl-modules"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-9538.json"}},{"package":{"name":"perl","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/perl?arch=source&distro=esm-infra-legacy%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.20.2-6","5.22.1-3","5.22.1-4","5.22.1-5","5.22.1-7","5.22.1-8","5.22.1-9","5.22.1-9ubuntu0.2","5.22.1-9ubuntu0.3","5.22.1-9ubuntu0.5","5.22.1-9ubuntu0.6","5.22.1-9ubuntu0.9","5.22.1-9ubuntu0.9+esm1","5.22.1-9ubuntu0.9+esm2","5.22.1-9ubuntu0.9+esm3","5.22.1-9ubuntu0.9+esm4"],"ecosystem_specific":{"binaries":[{"binary_name":"libperl5.22","binary_version":"5.22.1-9ubuntu0.9+esm4"},{"binary_name":"perl","binary_version":"5.22.1-9ubuntu0.9+esm4"},{"binary_version":"5.22.1-9ubuntu0.9+esm4","binary_name":"perl-base"},{"binary_name":"perl-debug","binary_version":"5.22.1-9ubuntu0.9+esm4"},{"binary_version":"5.22.1-9ubuntu0.9+esm4","binary_name":"perl-modules-5.22"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-9538.json"}},{"package":{"name":"perl","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/perl?arch=source&distro=esm-infra%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.26.0-8ubuntu1","5.26.1-2ubuntu1","5.26.1-3","5.26.1-4","5.26.1-4build1","5.26.1-5","5.26.1-6","5.26.1-6ubuntu0.1","5.26.1-6ubuntu0.2","5.26.1-6ubuntu0.3","5.26.1-6ubuntu0.5","5.26.1-6ubuntu0.6","5.26.1-6ubuntu0.7","5.26.1-6ubuntu0.7+esm2","5.26.1-6ubuntu0.7+esm3","5.26.1-6ubuntu0.7+esm4"],"ecosystem_specific":{"binaries":[{"binary_name":"libperl5.26","binary_version":"5.26.1-6ubuntu0.7+esm4"},{"binary_name":"perl","binary_version":"5.26.1-6ubuntu0.7+esm4"},{"binary_version":"5.26.1-6ubuntu0.7+esm4","binary_name":"perl-base"},{"binary_name":"perl-debug","binary_version":"5.26.1-6ubuntu0.7+esm4"},{"binary_name":"perl-modules-5.26","binary_version":"5.26.1-6ubuntu0.7+esm4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-9538.json"}},{"package":{"name":"perl","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/perl?arch=source&distro=esm-infra%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.28.1-6build1","5.30.0-7","5.30.0-9","5.30.0-9build1","5.30.0-9ubuntu0.2","5.30.0-9ubuntu0.3","5.30.0-9ubuntu0.4","5.30.0-9ubuntu0.5","5.30.0-9ubuntu0.5+esm2","5.30.0-9ubuntu0.5+esm3","5.30.0-9ubuntu0.5+esm4"],"ecosystem_specific":{"binaries":[{"binary_name":"libperl5.30","binary_version":"5.30.0-9ubuntu0.5+esm4"},{"binary_name":"perl","binary_version":"5.30.0-9ubuntu0.5+esm4"},{"binary_name":"perl-base","binary_version":"5.30.0-9ubuntu0.5+esm4"},{"binary_name":"perl-debug","binary_version":"5.30.0-9ubuntu0.5+esm4"},{"binary_version":"5.30.0-9ubuntu0.5+esm4","binary_name":"perl-modules-5.30"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-9538.json"}},{"package":{"name":"perl","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/perl?arch=source&distro=jammy"}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