Pillow tiled-TIFF decoder reads past tile buffer in copy4 (Unpack.c:1290)

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Pillow is a Python imaging library. From 8.2.0 until 13.0.0, Pillow's tiled-TIFF decoder can read past the tile buffer while copying four-byte pixels. In _decodeTile, libtiff can return a tile allocation smaller than the required row stride multiplied by the tile length, and Pillow's stride-and-copy loop walks beyond that allocation. An attacker can supply a crafted tiled TIFF to an application that loads it. This can expose adjacent heap data in pixels or crash the process. This issue is fixed in version 13.0.0.

Source published

19 Oct 2026 20:59:15 UTC

Source modified

28 Oct 2026 15:24:49 UTC

Observed here

28 Oct 2026 16:46:48 UTC

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CVSS 3.1 · 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L