CVE-2026-59204 PUBLISHED

Pillow JPEG2000 tiled decode retains a growing scratch buffer and can be used for denial of service

Assigner: GitHub_M
Reserved: 02.07.2026 Published: 14.07.2026 Updated: 14.07.2026

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.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CVSS Score: 8.7

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	None	Availability	High	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	python-pillow
Product	Pillow
Versions	Version >= 8.2.0, < 12.3.0 is affected

References

Problem Types

CWE-789: Memory Allocation with Excessive Size Value CWE