CVE-2026-59204

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.

• CWE-789
• CWE-770

• https://github.com/python-pillow/Pillow/commit/13ada41172142f2fd9f0906f615a00ea623a11caPatch
• https://github.com/python-pillow/Pillow/pull/9704Exploit, Issue Tracking, Patch
• https://github.com/python-pillow/Pillow/releases/tag/12.3.0Release Notes
• https://github.com/python-pillow/Pillow/security/advisories/GHSA-vjc4-5qp5-m44jExploit, Vendor Advisory
• https://github.com/python-pillow/Pillow/security/advisories/GHSA-vjc4-5qp5-m44jExploit, Vendor Advisory

Published

Jul 14, 2026

Last Modified

Jul 21, 2026

Status

Modified

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