CVE-2026-42309 — Pillow: Heap buffer overflow with nested list coordinates
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, Ima…
Published: 2026-05-09 · CVSS: 5.1 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7