{"id":"UBUNTU-CVE-2021-40656","details":"libsixel before 1.10 is vulnerable to Buffer Overflow in libsixel/src/quant.c:867.","modified":"2026-01-20T17:16:04.764714Z","published":"2022-04-08T16:15:00Z","upstream":["CVE-2021-40656"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-40656"},{"type":"REPORT","url":"https://github.com/libsixel/libsixel/issues/25"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2021-40656"}],"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_version":"1.5.2-2","binary_name":"libsixel-bin"},{"binary_version":"1.5.2-2","binary_name":"libsixel-dev"},{"binary_version":"1.5.2-2","binary_name":"libsixel1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-40656.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_version":"1.7.3-1","binary_name":"libsixel-bin"},{"binary_version":"1.7.3-1","binary_name":"libsixel-dev"},{"binary_version":"1.7.3-1","binary_name":"libsixel-examples"},{"binary_version":"1.7.3-1","binary_name":"libsixel1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-40656.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_version":"1.8.2-2.1","binary_name":"libsixel-dev"},{"binary_version":"1.8.2-2.1","binary_name":"libsixel-examples"},{"binary_version":"1.8.2-2.1","binary_name":"libsixel1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-40656.json"}},{"package":{"name":"libsixel","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/libsixel@1.10.3-3?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.8.6-2","1.10.3-2","1.10.3-3"],"ecosystem_specific":{"binaries":[{"binary_version":"1.10.3-3","binary_name":"libsixel-bin"},{"binary_version":"1.10.3-3","binary_name":"libsixel-dev"},{"binary_version":"1.10.3-3","binary_name":"libsixel-examples"},{"binary_version":"1.10.3-3","binary_name":"libsixel1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-40656.json"}},{"package":{"name":"libsixel","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/libsixel@1.10.3-3build1?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.10.3-3","1.10.3-3build1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.10.3-3build1","binary_name":"libsixel-bin"},{"binary_version":"1.10.3-3build1","binary_name":"libsixel-dev"},{"binary_version":"1.10.3-3build1","binary_name":"libsixel-examples"},{"binary_version":"1.10.3-3build1","binary_name":"libsixel1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-40656.json"}},{"package":{"name":"libsixel","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/libsixel@1.10.5-1?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.10.5-1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.10.5-1","binary_name":"libsixel-bin"},{"binary_version":"1.10.5-1","binary_name":"libsixel-dev"},{"binary_version":"1.10.5-1","binary_name":"libsixel-examples"},{"binary_version":"1.10.5-1","binary_name":"libsixel1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-40656.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}