8.1.1

Security

:cve:2021-25289: Correct the fix for :cve:2020-35654 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

The previous fix for :cve:2020-35654 was insufficient due to incorrect error checking in TiffDecode.c.

:cve:2021-25290: Fix buffer overflow in TiffDecode.c ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

In TiffDecode.c, there is a negative-offset memcpy with an invalid size.

:cve:2021-25291: Fix buffer overflow in TIFFReadRGBATile ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

In TiffDecode.c, invalid tile boundaries could lead to an out-of-bounds read in TIFFReadRGBATile.

:cve:2021-25292: Fix DOS attack ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

The PDF parser has a catastrophic backtracking regex that could be used as a DOS attack.

:cve:2021-25293: Fix buffer overflow in SgiRleDecode.c ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

There is an out-of-bounds read in SgiRleDecode.c since Pillow 4.3.0.

Other changes

A crash with the feature flags for libimagequant, libjpeg-turbo, WebP and XCB on unreleased Python 3.10 has been fixed (:issue:5193).