{"id":"UBUNTU-CVE-2018-20349","details":"The igraph_i_strdiff function in igraph_trie.c in igraph through 0.7.1 has an NULL pointer dereference that allows attackers to cause a denial of service (application crash) via a crafted object.","modified":"2026-04-22T11:51:39.604028Z","published":"2018-12-22T00:29:00Z","related":["USN-4644-1"],"upstream":["CVE-2018-20349"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2018-20349"},{"type":"REPORT","url":"https://github.com/igraph/igraph/issues/1141"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4644-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2018-20349"}],"affected":[{"package":{"name":"igraph","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/igraph@0.7.1-2.1+deb9u1build0.16.04.1?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.7.1-2.1+deb9u1build0.16.04.1"}]}],"versions":["0.7.1-2.1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"0.7.1-2.1+deb9u1build0.16.04.1","binary_name":"libigraph0v5"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-20349.json"}},{"package":{"name":"igraph","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/igraph@0.7.1-2.1+deb9u1build0.18.04.1?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.7.1-2.1+deb9u1build0.18.04.1"}]}],"versions":["0.7.1-2.1build2"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"0.7.1-2.1+deb9u1build0.18.04.1","binary_name":"libigraph0v5"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-20349.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}