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BIT-pillow-2026-42309 — Pillow: Heap buffer overflow with nested list coordinates

Affected: Bitnami: pillow

Pillow is a Python imaging library. From version 11.2.1 to before version 12.2.0, passing nested lists as coordinates to APIs that accept coordinates such as ImagePath.Path, ImageDraw.ImageDraw.polygon and ImageDraw.ImageDraw.line could cause a heap buffer overflow, as nested lists were recursively unpacked beyond the allocated buffer. Coordinate lists are now validated to contain exactly two numeric coordinates. This issue has been patched in version 12.2.0.

CVE-2026-42309 — Pillow: Heap buffer overflow with nested list coordinates

Affected: python-pillow Pillow

GHSA-5xmw-vc9v-4wf2 — Pillow has a heap buffer overflow with nested list coordinates

Affected: PyPI: pillow

Passing nested lists as coordinates to APIs that accept coordinates such as `ImagePath.Path`, `ImageDraw.ImageDraw.polygon` and `ImageDraw.ImageDraw.line` could cause a heap buffer overflow, as nested lists were recursively unpacked beyond the allocated buffer. Coordinate lists are now validated to contain exactly two numeric coordinates. This was introduced in Pillow 11.2.1.

PYSEC-2026-2251

Affected: PyPI: pillow