CVE-2026-55379
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 3.1
- 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - EPSS
- 0.5% chance of exploitation in the next 30 days; higher than 44% of CVEs (scores of 2026-10-25)
- CWE
- CWE-789
- Published
- Modified
- Record from
- the NVD, synced
Affected
- python:pillow
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-45hq-cxwh-f6vc | PyPI | pillow | <12.3.0 | 12.3.0 |
| PYSEC-2026-2255 | PyPI | pillow | <12.3.0 | 12.3.0 |
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-45hq-cxwh-f6vc
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-45hq-cxwh-f6vc