CVE-2026-59204

HIGH8.7

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

Published Jul 14, 2026

Modified 4 days ago

Details

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.

References

WEB

https://github.com/python-pillow/Pillow/commit/13ada41172142f2fd9f0906f615a00ea623a11ca

WEB

https://github.com/python-pillow/Pillow/pull/9704

WEB

https://github.com/python-pillow/Pillow/releases/tag/12.3.0

WEB

https://github.com/python-pillow/Pillow/security/advisories/GHSA-vjc4-5qp5-m44j

ADVISORY

https://www.cve.org/CVERecord?id=CVE-2026-59204

CVSS Analysis