{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "versions": [
              {
                "introduced": "1.24.0"
              },
              {
                "fixed": "1.26.7"
              }
            ]
          },
          "events": [
            {
              "introduced": "21fb0a2bf815c927cf09881f799f78cbece0daf2"
            },
            {
              "fixed": "12b4cdcd0b70231e0dc5cd777abd9339d61230ab"
            }
          ],
          "repo": "https://github.com/artifexsoftware/mupdf",
          "type": "GIT"
        }
      ]
    }
  ],
  "details": "A null pointer dereference occurs in the function break_word_for_overflow_wrap() in MuPDF 1.26.4 when rendering a malformed EPUB document. Specifically, the function calls fz_html_split_flow() to split a FLOW_WORD node, but does not check if node-\u003enext is valid before accessing node-\u003enext-\u003eoverflow_wrap, resulting in a crash if the split fails or returns a partial node chain.",
  "id": "CVE-2025-55780",
  "modified": "2026-03-15T13:51:44.219406609Z",
  "published": "2025-09-23T18:15:34.743Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/ISH2YU/CVE-2025-55780/tree/main"
    },
    {
      "type": "REPORT",
      "url": "https://bugs.ghostscript.com/show_bug.cgi?id=708720"
    },
    {
      "type": "REPORT",
      "url": "https://cgit.ghostscript.com/cgi-bin/cgit.cgi/mupdf.git/commit/?id=bdd5d241748807378a78a622388e0312332513c5"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}