{"id":"CVE-2025-55780","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.","modified":"2026-04-10T05:26:19.946865Z","published":"2025-09-23T18:15:34.743Z","related":["openSUSE-SU-2026:10214-1"],"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/artifexsoftware/mupdf","events":[{"introduced":"21fb0a2bf815c927cf09881f799f78cbece0daf2"},{"fixed":"12b4cdcd0b70231e0dc5cd777abd9339d61230ab"}],"database_specific":{"versions":[{"introduced":"1.24.0"},{"fixed":"1.26.7"}]}}],"versions":["1.24.0","1.25.0-rc1","1.26.0","1.26.0-rc1","1.26.0-rc2","1.26.1","1.26.2","1.26.3","1.26.4","1.26.5","1.26.6"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-55780.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}