CVE-2025-55780

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.

Database specific

{
    "cna_assigner": "mitre",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/55xxx/CVE-2025-55780.json"
}

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

Show details

{
    "cpe": "cpe:2.3:a:artifex:mupdf:*:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "1.24.0"
        },
        {
            "fixed": "1.26.7"
        }
    ],
    "source": "CPE_RANGE"
}

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"

vanir_signatures

[
    {
        "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",
        "target": {
            "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",
        "source": "https://github.com/artifexsoftware/mupdf/commit/12b4cdcd0b70231e0dc5cd777abd9339d61230ab",
        "target": {
            "file": "source/pdf/pdf-annot.c",
            "function": "pdf_nuke_annots"
        }
    }
]

vanir_signatures_modified

"2026-08-12T15:14:07Z"