high7.5
CVE-2026-55380
Pillow `GdImageFile._open()`: image dimensions accepted without `_decompression_bomb_check()`
Impact
Pillow is a Python imaging library. Prior to 12.3.0, PIL/GdImageFile.py GdImageFile._open() read image dimensions from the GD 2.x header and stored them in self._size without calling Image._decompression_bomb_check(), allowing a crafted .gd file to trigger excessive C-heap allocation when loaded. This issue is fixed in version 12.3.0.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | pillow | < 12.3.0 | 12.3.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Python | Pillow | before 12.3.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-phj9-mv4w-65pm
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-phj9-mv4w-65pm
- https://nvd.nist.gov/vuln/detail/CVE-2026-55380
- https://github.com/python-pillow/Pillow/commit/f39b0ae6624eb2d7c5c5d651d9bb5fdbd96a8675
- https://github.com/pypa/advisory-database/tree/main/vulns/pillow/PYSEC-2026-2256.yaml
- https://github.com/python-pillow/Pillow/blob/main/docs/releasenotes/12.3.0.rst