{"id":"DEBIAN-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":"2026-09-01T20:05:54.506238688Z","published":"2025-09-23T18:15:34.743Z","upstream":["CVE-2025-55780"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2025-55780"}],"affected":[{"package":{"name":"mupdf","ecosystem":"Debian:12","purl":"pkg:deb/debian/mupdf?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.21.1+ds2-1","1.21.1+ds2-1+deb12u1","1.22.1+ds1-1","1.22.2+ds1-1","1.22.2+ds1-2","1.23.10+ds1-1","1.23.10+ds1-2","1.23.6+ds1-1","1.23.7+ds1-1","1.24.10+ds1-1","1.24.3+ds1-1","1.24.8+ds2-1","1.24.8+ds2-2","1.24.9+ds1-1","1.25.1+ds1-1","1.25.1+ds1-2","1.25.1+ds1-3","1.25.1+ds1-4","1.25.1+ds1-5","1.25.1+ds1-6","1.25.1+ds1-7","1.25.1+ds1-8","1.25.1+ds1-9","1.27.0+ds1-1","1.27.0+ds1-2","1.27.0+ds1-3","1.27.0+ds1-4","1.27.0+ds1-5","1.27.0+ds1-6","1.28.0+ds1-1","1.28.2+ds1-1","1.28.2+ds1-2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-55780.json"}},{"package":{"name":"mupdf","ecosystem":"Debian:13","purl":"pkg:deb/debian/mupdf?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.25.1+ds1-6","1.25.1+ds1-6+deb13u1","1.25.1+ds1-7","1.25.1+ds1-8","1.25.1+ds1-9","1.27.0+ds1-1","1.27.0+ds1-2","1.27.0+ds1-3","1.27.0+ds1-4","1.27.0+ds1-5","1.27.0+ds1-6","1.28.0+ds1-1","1.28.2+ds1-1","1.28.2+ds1-2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-55780.json"}},{"package":{"name":"mupdf","ecosystem":"Debian:14","purl":"pkg:deb/debian/mupdf?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.27.0+ds1-2"}]}],"versions":["1.25.1+ds1-6","1.25.1+ds1-7","1.25.1+ds1-8","1.25.1+ds1-9","1.27.0+ds1-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-55780.json"}}],"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"}]}