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

python-pillow Pillow · CVE-2026-59204
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What is it?

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.

Evidence

No coverage recorded yet.

Exploitation

  • Public proof of concept
  • Exploited in the wild
  • Listed as known exploited
CVSS
8.7
EPSS
0.4%
First seen
1 d ago
Status
corroborated

All python-pillow vulnerabilities