{"id":"USN-4040-1","summary":"expat vulnerability","details":"It was discovered that Expat incorrectly handled certain XML files.\nAn attacker could possibly use this issue to cause a denial of service.\n","modified":"2026-04-27T15:27:18.343857Z","published":"2019-06-26T18:36:24Z","related":["UBUNTU-CVE-2018-20843"],"upstream":["CVE-2018-20843","UBUNTU-CVE-2018-20843"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4040-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2018-20843"}],"affected":[{"package":{"name":"expat","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/expat@2.1.0-7ubuntu0.16.04.4?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.1.0-7ubuntu0.16.04.4"}]}],"versions":["2.1.0-7","2.1.0-7ubuntu0.16.04.1","2.1.0-7ubuntu0.16.04.2","2.1.0-7ubuntu0.16.04.3"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"expat","binary_version":"2.1.0-7ubuntu0.16.04.4"},{"binary_name":"lib64expat1","binary_version":"2.1.0-7ubuntu0.16.04.4"},{"binary_name":"libexpat1","binary_version":"2.1.0-7ubuntu0.16.04.4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4040-1.json","cves_map":{"ecosystem":"Ubuntu:16.04:LTS","cves":[{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"low"}],"id":"CVE-2018-20843"}]}}},{"package":{"name":"expat","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/expat@2.2.5-3ubuntu0.1?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.2.5-3ubuntu0.1"}]}],"versions":["2.2.3-1","2.2.3-2","2.2.5-0ubuntu2","2.2.5-3"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"expat","binary_version":"2.2.5-3ubuntu0.1"},{"binary_name":"libexpat1","binary_version":"2.2.5-3ubuntu0.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4040-1.json","cves_map":{"ecosystem":"Ubuntu:18.04:LTS","cves":[{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"low"}],"id":"CVE-2018-20843"}]}}}],"schema_version":"1.7.5"}