{"id":"UBUNTU-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":"2026-01-20T18:50:17.706030Z","published":"2025-09-23T18:15:00Z","upstream":["CVE-2025-55780"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2025-55780"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2025-55780"},{"type":"REPORT","url":"https://bugs.ghostscript.com/show_bug.cgi?id=708720"}],"affected":[{"package":{"name":"mupdf","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/mupdf@1.7a-1ubuntu0.1~esm1?arch=source&distro=esm-apps/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.7-1","1.7a-1","1.7a-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.7a-1ubuntu0.1~esm1","binary_name":"libmupdf-dev"},{"binary_version":"1.7a-1ubuntu0.1~esm1","binary_name":"mupdf"},{"binary_version":"1.7a-1ubuntu0.1~esm1","binary_name":"mupdf-tools"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-55780.json"}},{"package":{"name":"mupdf","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/mupdf@1.12.0+ds1-1ubuntu0.1~esm2?arch=source&distro=esm-apps/bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.11+ds1-1.1","1.11+ds1-2","1.12.0+ds1-1","1.12.0+ds1-1ubuntu0.1~esm1","1.12.0+ds1-1ubuntu0.1~esm2"],"ecosystem_specific":{"binaries":[{"binary_version":"1.12.0+ds1-1ubuntu0.1~esm2","binary_name":"libmupdf-dev"},{"binary_version":"1.12.0+ds1-1ubuntu0.1~esm2","binary_name":"mupdf"},{"binary_version":"1.12.0+ds1-1ubuntu0.1~esm2","binary_name":"mupdf-tools"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-55780.json"}},{"package":{"name":"mupdf","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/mupdf@1.16.1+ds1-1ubuntu1+esm2?arch=source&distro=esm-apps/focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.15.0+ds1-1","1.16.1+ds1-1ubuntu1","1.16.1+ds1-1ubuntu1+esm1","1.16.1+ds1-1ubuntu1+esm2"],"ecosystem_specific":{"binaries":[{"binary_version":"1.16.1+ds1-1ubuntu1+esm2","binary_name":"libmupdf-dev"},{"binary_version":"1.16.1+ds1-1ubuntu1+esm2","binary_name":"mupdf"},{"binary_version":"1.16.1+ds1-1ubuntu1+esm2","binary_name":"mupdf-tools"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-55780.json"}},{"package":{"name":"mupdf","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/mupdf@1.19.0+ds1-2ubuntu0.1~esm1?arch=source&distro=esm-apps/jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.17.0+ds1-2","1.19.0+ds1-1","1.19.0+ds1-1build1","1.19.0+ds1-2","1.19.0+ds1-2ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.19.0+ds1-2ubuntu0.1~esm1","binary_name":"libmupdf-dev"},{"binary_version":"1.19.0+ds1-2ubuntu0.1~esm1","binary_name":"mupdf"},{"binary_version":"1.19.0+ds1-2ubuntu0.1~esm1","binary_name":"mupdf-tools"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-55780.json"}},{"package":{"name":"mupdf","ecosystem":"Ubuntu:Pro:24.04:LTS","purl":"pkg:deb/ubuntu/mupdf@1.23.10+ds1-1ubuntu0.1~esm1?arch=source&distro=esm-apps/noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.22.2+ds1-2","1.22.2+ds1-2build1","1.23.6+ds1-1","1.23.7+ds1-1","1.23.10+ds1-1","1.23.10+ds1-1build1","1.23.10+ds1-1build2","1.23.10+ds1-1build3","1.23.10+ds1-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.23.10+ds1-1ubuntu0.1~esm1","binary_name":"libmupdf-dev"},{"binary_version":"1.23.10+ds1-1ubuntu0.1~esm1","binary_name":"mupdf"},{"binary_version":"1.23.10+ds1-1ubuntu0.1~esm1","binary_name":"mupdf-tools"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-55780.json"}},{"package":{"name":"mupdf","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/mupdf@1.25.1+ds1-7?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.25.1+ds1-5build2","1.25.1+ds1-6","1.25.1+ds1-7"],"ecosystem_specific":{"binaries":[{"binary_version":"1.25.1+ds1-7","binary_name":"libmupdf-dev"},{"binary_version":"1.25.1+ds1-7","binary_name":"libmupdf25.1"},{"binary_version":"1.25.1+ds1-7","binary_name":"mupdf"},{"binary_version":"1.25.1+ds1-7","binary_name":"mupdf-tools"},{"binary_version":"1.25.1+ds1-7","binary_name":"python3-mupdf"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-55780.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}