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diff -up qt-everywhere-opensource-src-4.8.7/src/gui/image/qppmhandler.cpp.me qt-everywhere-opensource-src-4.8.7/src/gui/image/qppmhandler.cpp
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--- qt-everywhere-opensource-src-4.8.7/src/gui/image/qppmhandler.cpp.me	2019-03-22 10:22:16.213800109 +0100
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+++ qt-everywhere-opensource-src-4.8.7/src/gui/image/qppmhandler.cpp	2019-03-22 10:22:40.721890281 +0100
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@@ -108,7 +108,7 @@ static bool read_pbm_header(QIODevice *d
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     else
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         mcc = read_pbm_int(device);               // get max color component
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-    if (w <= 0 || w > 32767 || h <= 0 || h > 32767 || mcc <= 0)
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+    if (w <= 0 || w > 32767 || h <= 0 || h > 32767 || mcc <= 0 || mcc > 0xffff)
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         return false;                                        // weird P.M image
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     return true;