CVE-2026-59204: Python Pillow

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

Pillow is a Python imaging library. From 8.2.0 through 12.2.0, src/libImaging/Jpeg2KDecode.c accumulates total_component_width across every tile in a JPEG2000 image instead of recomputing it per tile, allowing a crafted tiled JPEG2000 file to force substantially higher transient memory usage and trigger out-of-memory failures during decoding. This issue is fixed in version 12.3.0.

Affected products

• Python Pillow: from 8.2.0, before 12.3.0 (fixed in 12.3.0)

Published 2026-07-14. Last modified 2026-07-21.