Fix for SGI Decode buffer overrun #5173
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* Independently found by a contributor and sent to Tidelift, and by Google's OSS Fuzz.
This was referenced Mar 8, 2021
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CVE-2020-35655, 4 Byte Read Overflow in SGIRleDecode.c, where the code was not correctly checking the offsets and length tables. Independently reported through Tidelift and Google's OSS-Fuzz. This vulnerability covers Pillow versions 4.3.0->8.0.1.