{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "versions": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "1.8.3"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "9d9d1863f5c96f48d679aa666e915592c5b378d0"
            }
          ],
          "repo": "https://github.com/saitoha/libsixel",
          "type": "GIT"
        }
      ]
    }
  ],
  "details": "Libsixel 1.8.3 contains a heap-based buffer overflow in the sixel_encode_highcolor function in tosixel.c.",
  "id": "CVE-2020-21548",
  "modified": "2026-03-13T21:50:09.756096904Z",
  "published": "2021-09-17T21:15:07.360Z",
  "references": [
    {
      "type": "FIX",
      "url": "https://github.com/saitoha/libsixel/issues/116"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}