Is CVE-2026-59199 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-59199?

CVE-2026-59199 has a CVSS v3 severity of HIGH (7.5).

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CVE-2026-59199

Description

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.