CVE-2025-55780 Affecting mupdf package, versions <1.27.0+ds1-2
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published25 Sept 2025
- disclosed23 Sept 2025
Introduced: 23 Sep 2025
CVE-2025-55780 (opens in a new tab)How to fix?
Upgrade Debian:14 mupdf to version 1.27.0+ds1-2 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream mupdf package and not the mupdf package as distributed by Debian.
See How to fix? for Debian:14 relevant fixed versions and status.
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->next is valid before accessing node->next->overflow_wrap, resulting in a crash if the split fails or returns a partial node chain.