CVE-2026-96644
Pillow: Heap over-read in WMF/EMF rendering via 16-bit dimension truncation (Windows builds)
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-125 |
| Vendor | python-pillow |
| Product | pillow |
| Published | Oct 21, 2026 |
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Affected Versions
python-pillow / Pillow
< 13.0.0
References
github.com: https://github.com/python-pillow/Pillow/security/advisories/GHSA-9v9v-9qvf-h2hj github.com: https://github.com/python-pillow/Pillow/pull/10120 github.com: https://github.com/python-pillow/Pillow/commit/4cf46bee338304c5c8968fd7f132ba0d40c428b7 github.com: https://github.com/python-pillow/Pillow/releases/tag/13.0.0