{"id":"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":"2026-03-15T22:34:56.174554Z","published":"2021-09-14T16:15:08.403Z","references":[{"type":"ADVISORY","url":"https://github.com/saitoha/libsixel/blob/master/ChangeLog"},{"type":"ADVISORY","url":"https://github.com/saitoha/libsixel/releases/tag/v1.8.4"},{"type":"FIX","url":"https://bitbucket.org/netbsd/pkgsrc/commits/6f0c011cbfccdffa635d04c84433b1a02687adad"},{"type":"FIX","url":"https://github.com/saitoha/libsixel/commit/cb373ab6614c910407c5e5a93ab935144e62b037"},{"type":"FIX","url":"https://github.com/saitoha/libsixel/issues/73"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/saitoha/libsixel","events":[{"introduced":"0"},{"fixed":"686d234ae20f97b9d816d4147ba3f4b90dbae72e"},{"fixed":"cb373ab6614c910407c5e5a93ab935144e62b037"}],"database_specific":{"versions":[{"introduced":"0"},{"fixed":"1.8.4"}]}}],"versions":["v0.11.0","v0.12.0","v0.14.0","v0.15.0","v0.16.0","v0.16.1","v0.17.0","v0.17.1","v0.17.2","v0.18.0","v0.19.0","v0.19.1","v0.19.2","v0.19.3","v0.19.4","v0.19.5","v0.19.6","v0.20.0","v0.21.0","v0.21.1","v0.22.0","v0.22.1","v0.22.2","v0.22.3","v0.23.0","v0.23.1","v0.23.2","v0.24.0","v0.24.2","v0.25.0","v0.25.1","v0.25.2","v0.25.3","v0.25.4","v0.25.5","v0.26.0","v0.27.0","v0.27.1","v0.28.0","v1.0.0","v1.0.1","v1.0.2","v1.0.3","v1.1.0","v1.1.1","v1.1.2","v1.1.3","v1.1.4","v1.1.5","v1.2.0","v1.2.1","v1.2.2","v1.2.3","v1.3.0","v1.3.1","v1.3.2","v1.3.3","v1.3.4","v1.3.5","v1.3.6","v1.4.0","v1.4.1","v1.4.10","v1.4.11","v1.4.12","v1.4.13","v1.4.2","v1.4.3","v1.4.4","v1.4.5","v1.4.6","v1.4.7","v1.4.8","v1.4.9","v1.5.0","v1.5.1","v1.5.2","v1.5.3","v1.6.0","v1.6.1","v1.7.0","v1.7.1","v1.7.2","v1.7.3","v1.8.0","v1.8.1","v1.8.2","v1.8.3"],"database_specific":{"vanir_signatures":[{"signature_version":"v1","target":{"function":"sixel_dither_new","file":"src/dither.c"},"source":"https://github.com/saitoha/libsixel/commit/cb373ab6614c910407c5e5a93ab935144e62b037","id":"CVE-2020-21048-3f5e5c8e","digest":{"function_hash":"219832859337229444931238207892599109504","length":1607},"deprecated":false,"signature_type":"Function"},{"signature_version":"v1","target":{"file":"src/dither.c"},"source":"https://github.com/saitoha/libsixel/commit/cb373ab6614c910407c5e5a93ab935144e62b037","id":"CVE-2020-21048-b2b72c87","digest":{"threshold":0.9,"line_hashes":["199361631072483740361989714307393008478","291343961692008382086549080687427033920","16784547706756229315325119660300077615","101018793880447773360178885930836492685","69736891406652933996193619171756760618","254643536321277286518119263644437622942","115812485349409838505546949009351511461"]},"deprecated":false,"signature_type":"Line"}],"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/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"}]}