CVE-2025-55780

A null pointer dereference occurs in the function breakwordforoverflowwrap() in MuPDF 1.26.4 when rendering a malformed EPUB document. Specifically, the function calls fzhtmlsplitflow() to split a FLOWWORD 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.

References

Affected packages

Git / github.com/artifexsoftware/mupdf

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"
        }
    ]
}

Affected versions

1.*

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"