CVE-2026-114501 Pillow: Arrow export leaks stale heap memory when PILLOW_ALIGNMENT > 1

Pillow is a Python imaging library. From 11.2.1 until 13.0.0, Arrow export assumes that an image's rows are tightly contiguous and exports from im-blocks0.ptr even when PILLOWALIGNMENT makes alignedlinesize include row padding or an aligned offset before the first row. The resulting Arrow buffer...

CVE-2026-114501

The Pillow Python imaging library (versions 11.2.1 through 13.0.0 ) contains a memory disclosure vulnerability during Arrow export . When PIOLLOW_ALIGNMENT is greater than 1, the library incorrectly assumes rows are tightly contiguous, exporting from an offset that may include uninitialized paddi...

CVE-2026-114501 Pillow: Arrow export leaks stale heap memory when PILLOW_ALIGNMENT > 1

Pillow is a Python imaging library. From 11.2.1 until 13.0.0, Arrow export assumes that an image's rows are tightly contiguous and exports from im-blocks0.ptr even when PILLOWALIGNMENT makes alignedlinesize include row padding or an aligned offset before the first row. The resulting Arrow buffer...