Vulnerability Description
Pillow is a Python imaging library. Prior to 12.3.0, PIL/BdfFontFile.py bdf_char() read the BBX width and height field from a BDF font file and passed attacker-controlled dimensions to Image.new() without calling Image._decompression_bomb_check(), bypassing Pillow's documented decompression bomb protection and allowing 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-45hq-cxwh-f6vcExploitVendor Advisory
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-45hq-cxwh-f6vcExploitVendor Advisory
FAQ
What is CVE-2026-55379?
CVE-2026-55379 is a vulnerability with a CVSS score of 7.5 (HIGH). Pillow is a Python imaging library. Prior to 12.3.0, PIL/BdfFontFile.py bdf_char() read the BBX width and height field from a BDF font file and passed attacker-controlled dimensions to Image.new() wit...
How severe is CVE-2026-55379?
CVE-2026-55379 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-2026-55379?
Check the references section above for vendor advisories and patch information. Affected products include: Python Pillow.