high7.5
CVE-2026-54059
Pillow `PcfFontFile._load_bitmaps()`: `Image.frombytes()` called without `_decompression_bomb_check()` — bomb protection bypass via PCF font loading
Impact
Pillow is a Python imaging library. Prior to 12.3.0, PIL/PcfFontFile.py _load_bitmaps() read glyph dimensions from the PCF METRICS section and passed them directly to Image.frombytes() without calling Image._decompression_bomb_check(), allowing crafted PCF font data to cause excessive memory allocation. 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-8v84-f9pq-wr9x
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-8v84-f9pq-wr9x
- https://nvd.nist.gov/vuln/detail/CVE-2026-54059
- https://github.com/python-pillow/Pillow/commit/0a263e6264aa5399988d9acd3bbfbca2ca3ec77d
- https://github.com/pypa/advisory-database/tree/main/vulns/pillow/PYSEC-2026-2253.yaml
- https://github.com/python-pillow/Pillow/blob/main/docs/releasenotes/12.3.0.rst