{"id":"UBUNTU-CVE-2017-18640","details":"The Alias feature in SnakeYAML before 1.26 allows entity expansion during a load operation, a related issue to CVE-2003-1564.","modified":"2026-01-30T00:38:50.401261Z","published":"2019-12-12T03:15:00Z","related":["USN-7368-1"],"upstream":["CVE-2017-18640"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2017-18640"},{"type":"REPORT","url":"https://bitbucket.org/asomov/snakeyaml/issues/377/allow-configuration-for-preventing-billion"},{"type":"REPORT","url":"https://mvnrepository.com/artifact/org.yaml/snakeyaml/1.25/usages"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2017-18640"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-7368-1"}],"affected":[{"package":{"name":"snakeyaml","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/snakeyaml@1.12-2ubuntu0.14.04.1~esm2?arch=source&distro=esm-infra-legacy/trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.12-2ubuntu0.14.04.1~esm2"}]}],"versions":["1.12-2","1.12-2ubuntu0.14.04.1~esm1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro","binaries":[{"binary_name":"libyaml-snake-java","binary_version":"1.12-2ubuntu0.14.04.1~esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2017/UBUNTU-CVE-2017-18640.json"}},{"package":{"name":"snakeyaml","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/snakeyaml@1.12-2ubuntu0.16.04.1~esm2?arch=source&distro=esm-apps/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.12-2ubuntu0.16.04.1~esm2"}]}],"versions":["1.12-2","1.12-2ubuntu0.16.04.1~esm1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_name":"libyaml-snake-java","binary_version":"1.12-2ubuntu0.16.04.1~esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2017/UBUNTU-CVE-2017-18640.json"}},{"package":{"name":"snakeyaml","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/snakeyaml@1.23-1+deb10u1ubuntu0.1~esm1?arch=source&distro=esm-apps/bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.23-1+deb10u1ubuntu0.1~esm1"}]}],"versions":["1.17-1","1.19-1","1.20-1","1.23-1~18.04","1.23-1+deb10u1build0.18.04.1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_name":"libyaml-snake-java","binary_version":"1.23-1+deb10u1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2017/UBUNTU-CVE-2017-18640.json"}},{"package":{"name":"snakeyaml","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/snakeyaml@1.25+ds-2ubuntu0.1+esm1?arch=source&distro=esm-apps/focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.25+ds-2ubuntu0.1+esm1"}]}],"versions":["1.23-1","1.25+ds-2","1.25+ds-2ubuntu0.1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_name":"libyaml-snake-java","binary_version":"1.25+ds-2ubuntu0.1+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2017/UBUNTU-CVE-2017-18640.json"}}],"schema_version":"1.7.3","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":"Ubuntu","score":"medium"}]}