{"id":"USN-8362-1","summary":"xz-utils vulnerability","details":"It was discovered that XZ Utils did not properly manage memory when\nattempting to append data to a decoded index that contained no records.\nAn attacker could possibly use this issue to cause XZ Utils to crash,\nresulting in a denial of service, or execute arbitrary code.","modified":"2026-06-02T14:14:25.491935661Z","published":"2026-06-02T09:17:00Z","related":["UBUNTU-CVE-2026-34743"],"upstream":["CVE-2026-34743","UBUNTU-CVE-2026-34743"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8362-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-34743"}],"affected":[{"package":{"name":"xz-utils","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/xz-utils?arch=source&distro=esm-infra-legacy%2Ftrusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.1.1alpha+20120614-2ubuntu2.14.04.1+esm2"}]}],"versions":["5.1.1alpha+20120614-2ubuntu1","5.1.1alpha+20120614-2ubuntu2","5.1.1alpha+20120614-2ubuntu2.14.04.1+esm1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro","binaries":[{"binary_version":"5.1.1alpha+20120614-2ubuntu2.14.04.1+esm2","binary_name":"liblzma5"},{"binary_version":"5.1.1alpha+20120614-2ubuntu2.14.04.1+esm2","binary_name":"xz-utils"},{"binary_version":"5.1.1alpha+20120614-2ubuntu2.14.04.1+esm2","binary_name":"xzdec"}]},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:Pro:14.04:LTS","cves":[{"severity":[{"score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U","type":"CVSS_V4"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","type":"CVSS_V3"},{"score":"low","type":"Ubuntu"}],"id":"CVE-2026-34743"}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8362-1.json"}},{"package":{"name":"xz-utils","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/xz-utils?arch=source&distro=esm-infra-legacy%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.1.1alpha+20120614-2ubuntu2.16.04.1+esm2"}]}],"versions":["5.1.1alpha+20120614-2ubuntu2","5.1.1alpha+20120614-2ubuntu2.16.04.1+esm1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro","binaries":[{"binary_version":"5.1.1alpha+20120614-2ubuntu2.16.04.1+esm2","binary_name":"liblzma5"},{"binary_version":"5.1.1alpha+20120614-2ubuntu2.16.04.1+esm2","binary_name":"xz-utils"},{"binary_version":"5.1.1alpha+20120614-2ubuntu2.16.04.1+esm2","binary_name":"xzdec"}]},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:Pro:16.04:LTS","cves":[{"severity":[{"score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U","type":"CVSS_V4"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","type":"CVSS_V3"},{"score":"low","type":"Ubuntu"}],"id":"CVE-2026-34743"}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8362-1.json"}},{"package":{"name":"xz-utils","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/xz-utils?arch=source&distro=esm-infra%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.2.2-1.3ubuntu0.1+esm1"}]}],"versions":["5.2.2-1.3","5.2.2-1.3ubuntu0.1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_version":"5.2.2-1.3ubuntu0.1+esm1","binary_name":"liblzma5"},{"binary_version":"5.2.2-1.3ubuntu0.1+esm1","binary_name":"xz-utils"},{"binary_version":"5.2.2-1.3ubuntu0.1+esm1","binary_name":"xzdec"}]},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:Pro:18.04:LTS","cves":[{"severity":[{"score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U","type":"CVSS_V4"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","type":"CVSS_V3"},{"score":"low","type":"Ubuntu"}],"id":"CVE-2026-34743"}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8362-1.json"}},{"package":{"name":"xz-utils","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/xz-utils?arch=source&distro=esm-infra%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.2.4-1ubuntu1.1+esm1"}]}],"versions":["5.2.4-1","5.2.4-1ubuntu1","5.2.4-1ubuntu1.1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_version":"5.2.4-1ubuntu1.1+esm1","binary_name":"liblzma5"},{"binary_version":"5.2.4-1ubuntu1.1+esm1","binary_name":"xz-utils"},{"binary_version":"5.2.4-1ubuntu1.1+esm1","binary_name":"xzdec"}]},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:Pro:20.04:LTS","cves":[{"severity":[{"score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U","type":"CVSS_V4"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","type":"CVSS_V3"},{"score":"low","type":"Ubuntu"}],"id":"CVE-2026-34743"}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8362-1.json"}},{"package":{"name":"xz-utils","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/xz-utils?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.2.5-2ubuntu1.1"}]}],"versions":["5.2.5-2","5.2.5-2build1","5.2.5-2build2","5.2.5-2ubuntu1"],"ecosystem_specific":{"availability":"No subscription 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