{"id":"UBUNTU-CVE-2018-11503","details":"The isfootnote function in markdown.c in libmarkdown.a in DISCOUNT 2.2.3a allows remote attackers to cause a denial of service (heap-based buffer over-read) via a crafted file, as demonstrated by mkd2html.","modified":"2025-10-24T04:47:02Z","published":"2018-05-26T21:29:00Z","upstream":["CVE-2018-11503"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2018-11503"},{"type":"REPORT","url":"https://github.com/Orc/discount/issues/189#issuecomment-392247798"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2018-11503"}],"affected":[{"package":{"name":"discount","ecosystem":"Ubuntu:14.04:LTS","purl":"pkg:deb/ubuntu/discount@2.1.7-1+deb8u1build0.14.04.1?arch=source&distro=trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.1.7-1+deb8u1build0.14.04.1"}]}],"versions":["2.1.6-2","2.1.7-1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"discount","binary_version":"2.1.7-1+deb8u1build0.14.04.1"},{"binary_name":"libmarkdown2","binary_version":"2.1.7-1+deb8u1build0.14.04.1"},{"binary_name":"libmarkdown2-dev","binary_version":"2.1.7-1+deb8u1build0.14.04.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-11503.json"}},{"package":{"name":"discount","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/discount@2.1.8-2?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.1.8-2"],"ecosystem_specific":{"binaries":[{"binary_name":"discount","binary_version":"2.1.8-2"},{"binary_name":"libmarkdown2","binary_version":"2.1.8-2"},{"binary_name":"libmarkdown2-dev","binary_version":"2.1.8-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-11503.json"}},{"package":{"name":"discount","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/discount@2.2.3b8-2?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.1.8-2","2.2.3b8-2"],"ecosystem_specific":{"binaries":[{"binary_name":"discount","binary_version":"2.2.3b8-2"},{"binary_name":"libmarkdown2","binary_version":"2.2.3b8-2"},{"binary_name":"libmarkdown2-dev","binary_version":"2.2.3b8-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-11503.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}