{"id":"USN-4968-1","summary":"lz4 vulnerability","details":"It was discovered that LZ4 incorrectly handled certain memory operations.\nIf a user or automated system were tricked into uncompressing a specially-\ncrafted LZ4 file, a remote attacker could use this issue to cause LZ4 to\ncrash, resulting in a denial of service, or possibly execute arbitrary\ncode.\n","modified":"2026-04-22T10:15:06.779322Z","published":"2021-05-26T17:29:47Z","related":["UBUNTU-CVE-2021-3520"],"upstream":["CVE-2021-3520","UBUNTU-CVE-2021-3520"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4968-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-3520"}],"affected":[{"package":{"name":"lz4","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/lz4@0.0~r131-2ubuntu3.1?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.0~r131-2ubuntu3.1"}]}],"versions":["0.0~r131-2ubuntu2","0.0~r131-2ubuntu3"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"0.0~r131-2ubuntu3.1","binary_name":"liblz4-1"},{"binary_version":"0.0~r131-2ubuntu3.1","binary_name":"liblz4-tool"}]},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:18.04:LTS","cves":[{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2021-3520"}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4968-1.json"}},{"package":{"name":"lz4","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/lz4@1.9.2-2ubuntu0.20.04.1?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.9.2-2ubuntu0.20.04.1"}]}],"versions":["1.9.1-1","1.9.1-2","1.9.2-2"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"1.9.2-2ubuntu0.20.04.1","binary_name":"liblz4-1"},{"binary_version":"1.9.2-2ubuntu0.20.04.1","binary_name":"liblz4-tool"},{"binary_version":"1.9.2-2ubuntu0.20.04.1","binary_name":"lz4"}]},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:20.04:LTS","cves":[{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2021-3520"}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4968-1.json"}}],"schema_version":"1.7.5"}