{"id":"CVE-2018-20820","details":"read_ujpg in jpgcoder.cc in Dropbox Lepton 1.2.1 allows attackers to cause a denial-of-service (application runtime crash because of an integer overflow) via a crafted file.","modified":"2026-10-20T13:44:52.973824565Z","published":"2019-04-23T14:29:00.367Z","database_specific":{},"references":[{"type":"FIX","url":"https://github.com/dropbox/lepton/commit/6a5ceefac1162783fffd9506a3de39c85c725761"},{"type":"FIX","url":"https://github.com/dropbox/lepton/issues/111"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/dropbox/lepton","events":[{"introduced":"c378cbfa2daaa99e8828be7395013f94cedb1bcc"},{"last_affected":"c378cbfa2daaa99e8828be7395013f94cedb1bcc"},{"fixed":"6a5ceefac1162783fffd9506a3de39c85c725761"}],"database_specific":{"extracted_events":[{"cpe":"cpe:2.3:a:dropbox:lepton:1.2.1:*:*:*:*:*:*:*","range":[{"introduced":"1.2.1"},{"last_affected":"1.2.1"}],"source":"CPE_STRING"},{"range":[{"fixed":"6a5ceefac1162783fffd9506a3de39c85c725761"}],"source":"REFERENCES_COMMIT"}]}}],"versions":["1.2.1"],"database_specific":{"vanir_signatures":[{"source":"https://github.com/dropbox/lepton/commit/6a5ceefac1162783fffd9506a3de39c85c725761","target":{"file":"src/lepton/jpgcoder.cc"},"deprecated":false,"digest":{"line_hashes":["291508219202119588538564923276176918018","96625002947938835274224164320718089154","213317746542680356999455718330753692033","173290755242118722020160640458997264056"],"threshold":0.9},"id":"CVE-2018-20820-7adfd9b9","signature_type":"Line","signature_version":"v1"},{"deprecated":false,"digest":{"length":6577,"function_hash":"84036937326432341110227860591100513513"},"id":"CVE-2018-20820-83a08037","signature_type":"Function","signature_version":"v1","source":"https://github.com/dropbox/lepton/commit/6a5ceefac1162783fffd9506a3de39c85c725761","target":{"function":"read_ujpg","file":"src/lepton/jpgcoder.cc"}}],"vanir_signatures_modified":"2026-10-20T13:44:52Z","source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-20820.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"}]}