CVE-2026-59199: Python Pillow

High severity, CVSS 7.5. EPSS: 0.4% chance of exploitation in the next 30 days.

Pillow is a Python imaging library. Prior to 12.3.0, Pillow public image coordinate APIs can trigger a native heap out-of-bounds write when given coordinates near the signed 32-bit integer limits in Image.paste(), Image.crop(), or Image.alpha_composite(). This issue is fixed in version 12.3.0.

Affected products

• Python Pillow: before 12.3.0 (fixed in 12.3.0)

Published 2026-07-14. Last modified 2026-07-15.