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CVE-2026-96644Pillow: Heap over-read in WMF/EMF rendering via 16-bit dimension truncation (Windows builds)
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.
7.1 HIGHEPSS 0.38%Not in KEVNVD: Modified
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 7.1 | HIGH | 4.0GitHub_M (CNA) | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N |
| 8.1 | HIGH | 3.1NVD | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H |
Details
- CVE ID
- CVE-2026-96644
- Status
- Modified
- Assigner (CNA)
- GitHub_M
- Published
- Oct 21, 2026
- Last modified
- 2026-10-28 19:19 UTC
- Weaknesses
- CWE-125 · Out-of-bounds Read
Affected Products
As published by the CNA in the CVE record.
python-pillowPillow1 version range
- < 13.0.0
References
- github.com https://github.com/python-pillow/Pillow/commit/4cf46bee338304c5c8968fd7f132ba0d40c428b7
- github.com https://github.com/python-pillow/Pillow/pull/10120
- github.com https://github.com/python-pillow/Pillow/releases/tag/13.0.0
- github.com https://github.com/python-pillow/Pillow/security/advisories/GHSA-9v9v-9qvf-h2hj