CVE-2026-96644: CWE-125: Out-of-bounds Read in python-pillow Pillow
Description
Pillow is a Python imaging library. Prior to 13.0.0 on Windows, src/PIL/WmfImagePlugin.py passes unchecked 32-bit WMF or EMF dimensions to the native drawwmf handler in src/display.c. The handler sizes a DIB allocation from 16-bit-truncated bcWidth and bcHeight fields but copies pixel data using the original full dimensions. A crafted wide, short metafile can pass the pixel-count decompression-bomb check and make the Windows-only renderer read beyond the heap buffer, potentially disclosing memory or crashing the process. This issue is fixed in version 13.0.0.
CVSS v4.0
Score 7.1high
Affected software
python-pillow
Pillow
Weaknesses
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-09-23T14:35:50.130Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ad92bea4d27ba8daa029893
Added to database: 10/21/2026, 21:17:30 UTC
Last updated: 10/21/2026, 21:17:30 UTC
Views: 1
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