{"id":"UBUNTU-CVE-2020-21048","details":"An issue in the dither.c component of libsixel prior to v1.8.4 allows attackers to cause a denial of service (DOS) via a crafted PNG file.","modified":"2026-04-22T14:11:30.721299Z","published":"2021-09-14T16:15:00Z","upstream":["CVE-2020-21048"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-21048"},{"type":"REPORT","url":"https://github.com/saitoha/libsixel/issues/73"},{"type":"REPORT","url":"https://github.com/saitoha/libsixel/commit/cb373ab6614c910407c5e5a93ab935144e62b037"},{"type":"REPORT","url":"https://github.com/saitoha/libsixel/commit/26ac06f3623279348f0dce2d191a9b6ca0c80226"},{"type":"REPORT","url":"https://github.com/saitoha/libsixel/releases/tag/v1.8.4"},{"type":"REPORT","url":"https://github.com/saitoha/libsixel/blob/master/ChangeLog"},{"type":"REPORT","url":"https://bitbucket.org/netbsd/pkgsrc/commits/6f0c011cbfccdffa635d04c84433b1a02687adad"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2020-21048"}],"affected":[{"package":{"name":"libsixel","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/libsixel@1.5.2-2?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.2-1","1.5.2-2"],"ecosystem_specific":{"binaries":[{"binary_name":"libsixel-bin","binary_version":"1.5.2-2"},{"binary_name":"libsixel1","binary_version":"1.5.2-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-21048.json"}},{"package":{"name":"libsixel","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/libsixel@1.7.3-1?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.5.2-2","1.7.3-1"],"ecosystem_specific":{"binaries":[{"binary_name":"libsixel-bin","binary_version":"1.7.3-1"},{"binary_name":"libsixel-examples","binary_version":"1.7.3-1"},{"binary_name":"libsixel1","binary_version":"1.7.3-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-21048.json"}},{"package":{"name":"libsixel","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/libsixel@1.8.2-2.1?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.8.2-1","1.8.2-2.1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.8.2-2.1","binary_name":"libsixel-bin"},{"binary_name":"libsixel-examples","binary_version":"1.8.2-2.1"},{"binary_name":"libsixel1","binary_version":"1.8.2-2.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-21048.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}