Raise error if declared JPEG2000 marker length is too small#9666
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hugovk
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Jun 9, 2026
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In two places in Jpeg2KImagePlugin, it is possible for file data to be such that Pillow calls
read()with a negative number.Pillow/src/PIL/Jpeg2KImagePlugin.py
Lines 110 to 111 in fd0956f
Pillow/src/PIL/Jpeg2KImagePlugin.py
Lines 329 to 333 in fd0956f
This would unintentionally read the rest of the file. This PR changes those places to raise an error instead.