Vulnerability Description
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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Python | Pillow | < 12.3.0 |
Related Weaknesses (CWE)
References
- https://github.com/python-pillow/Pillow/blob/main/docs/releasenotes/12.3.0.rstRelease Notes
- https://github.com/python-pillow/Pillow/commit/0a263e6264aa5399988d9acd3bbfbca2cPatch
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-8v84-f9pq-wr9xExploitVendor Advisory
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-8v84-f9pq-wr9xExploitVendor Advisory
FAQ
What is CVE-2026-54059?
CVE-2026-54059 is a vulnerability with a CVSS score of 7.5 (HIGH). 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...
How severe is CVE-2026-54059?
CVE-2026-54059 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-54059?
Check the references section above for vendor advisories and patch information. Affected products include: Python Pillow.