An issue was discovered in Artifex MuPDF before 1912de5f08e90af1d9d0a9791f58ba3afdb9d465. The pdfrunxobject function in pdf-op-run.c encounters a NULL pointer dereference during a Fitz fzpaintpixmapwithmask painting operation. Versions 1.11 and later are unaffected.
[
    {
        "id": "CVE-2017-5991-03bb9f12",
        "deprecated": false,
        "signature_version": "v1",
        "signature_type": "Function",
        "target": {
            "file": "source/fitz/load-jpx.c",
            "function": "jpx_write"
        },
        "digest": {
            "function_hash": "169602091508112698605693186521903319646",
            "length": 1818.0
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        "source": "https://github.com/artifexsoftware/mupdf/commit/34e18d127a02146e3415b33c4b67389ce1ddb614"
    },
    {
        "id": "CVE-2017-5991-0bed08d1",
        "deprecated": false,
        "signature_version": "v1",
        "signature_type": "Line",
        "target": {
            "file": "source/fitz/load-jpx.c"
        },
        "digest": {
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            "threshold": 0.9
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        "source": "https://github.com/artifexsoftware/mupdf/commit/34e18d127a02146e3415b33c4b67389ce1ddb614"
    },
    {
        "id": "CVE-2017-5991-3325bc74",
        "deprecated": false,
        "signature_version": "v1",
        "signature_type": "Function",
        "target": {
            "file": "source/fitz/load-jpx.c",
            "function": "jpx_read_image"
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        "digest": {
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        "source": "https://github.com/artifexsoftware/mupdf/commit/34e18d127a02146e3415b33c4b67389ce1ddb614"
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]