{"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":"2026-08-12T15:14:07.362033Z","published":"2025-09-23T00:00:00Z","related":["openSUSE-SU-2026:10214-1","openSUSE-SU-2026:21180-1"],"database_specific":{"cna_assigner":"mitre","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/55xxx/CVE-2025-55780.json"},"references":[{"type":"WEB","url":"https://bugs.ghostscript.com/show_bug.cgi?id=708720"},{"type":"WEB","url":"https://cgit.ghostscript.com/cgi-bin/cgit.cgi/mupdf.git/commit/?id=bdd5d241748807378a78a622388e0312332513c5"},{"type":"WEB","url":"https://github.com/ISH2YU/CVE-2025-55780/tree/main"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/55xxx/CVE-2025-55780.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-55780"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/artifexsoftware/mupdf","events":[{"introduced":"21fb0a2bf815c927cf09881f799f78cbece0daf2"},{"fixed":"12b4cdcd0b70231e0dc5cd777abd9339d61230ab"}],"database_specific":{"cpe":"cpe:2.3:a:artifex:mupdf:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"1.24.0"},{"fixed":"1.26.7"}],"source":"CPE_RANGE"}}],"versions":["1.26.6","1.26.5","1.26.4","1.26.3","1.26.2","1.26.1","1.26.0","1.26.0-rc2","1.26.0-rc1","1.25.0-rc1","1.24.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-55780.json","vanir_signatures_modified":"2026-08-12T15:14:07Z","vanir_signatures":[{"target":{"file":"source/pdf/pdf-annot.c"},"deprecated":false,"digest":{"line_hashes":["229319537919293215292104303237191739302","339386139690771417552178309694768603712","202131940347821144349341725623391116795","226906063312053288353481271262093277461","80367140849276628607848978166554133068","236566374234668614499504302664669397581","312336065023311552986949716626773661135","208156177153325554083866538353559506554","316228358460883828609648182839773496557","141761615512680053411307860903928113032","140894252968565933228393602031855578523","236566374234668614499504302664669397581"],"threshold":0.9},"id":"CVE-2025-55780-7e8d1d45","signature_type":"Line","signature_version":"v1","source":"https://github.com/artifexsoftware/mupdf/commit/12b4cdcd0b70231e0dc5cd777abd9339d61230ab"},{"source":"https://github.com/artifexsoftware/mupdf/commit/12b4cdcd0b70231e0dc5cd777abd9339d61230ab","target":{"function":"pdf_nuke_annots","file":"source/pdf/pdf-annot.c"},"deprecated":false,"digest":{"function_hash":"140261027352262709890614608527069886385","length":488},"id":"CVE-2025-55780-867ef66a","signature_type":"Function","signature_version":"v1"}]}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}