Pillow is a Python imaging library. Prior to 12.3.0, PIL/FontFile.py FontFile.compile() assembled per-glyph images into a combined bitmap with Image.new(1, (xsize, ysize)) without calling Image._decompression_bomb_check(), allowing a font to trigger excessive allocation during conversion or saving. This issue is fixed in version 12.3.0.
Weakness
The product allocates memory based on an untrusted, large size value, but it does not ensure that the size is within expected limits, allowing arbitrary amounts of memory to be allocated.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Pillow | Python | * | 12.3.0 (excluding) |
| Red Hat Enterprise Linux 8 | RedHat | python-pillow-0:5.1.1-22.el8_10 | * |
| Pillow | Ubuntu | questing | * |
Potential Mitigations
References
- https://github.com/python-pillow/Pillow/blob/main/docs/releasenotes/12.3.0.rst
- https://github.com/python-pillow/Pillow/commit/0a263e6264aa5399988d9acd3bbfbca2ca3ec77d
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-5x94-69rx-g8h2
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-5x94-69rx-g8h2