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A flaw in the pure-python PDF library allows an attacker to craft a PDF that leads to RAM exhaustion. This occurs when accessing a stream compressed using '/FlateDecode' with a `/Predictor` unequal to 1 and large predictor parameters.

A flaw in the pure-python PDF library allows an attacker to craft a PDF that causes long runtimes. This occurs when loading a PDF in incremental mode that contains a large `/Size` value in the trailer.

A flaw in the pypdf library allows an attacker to craft a PDF file that causes RAM exhaustion, leading to a denial of service. This occurs when accessing an image using the `/FlateDecode` filter with excessively large size values.