CVE-2026-59199

Pillow: Heap out-of-bounds write `Image.paste()` / `Image.crop()` via signed coordinate overflow

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

python-pillow · Pillow

CVSS v3.1 GITHUB

7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

0.39% chance of exploitation in the next 30 days, 31st percentile

Published

2026-07-14

Updated

2026-07-15

Proof-of-concept exploits (1)

• advisories/GHSA-6r8x-57c9-28j4

Security advisories

• python-pillow/Pillow/security/advisories/GHSA-6r8x-57c9-28j4
• python-pillow/Pillow/pull/9703

References

• CVE Record
• NVD entry