Vulnerability details
CVE-2026-96644
python-pillow Pillow
Pillow: Heap over-read in WMF/EMF rendering via 16-bit dimension truncation (Windows builds)
CVSS 4.0
7.1High
Official 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 scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 7.1High | 4.0 | CVEProject cvelistV5 (CNA) (GitHub_M) | 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 |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| python-pillow | Pillow | < 13.0.0 | CVEProject cvelistV5 (CNA) |
References and advisories
4- https://github.com/python-pillow/Pillow/pull/10120 x_refsource_MISC
- https://github.com/python-pillow/Pillow/commit/4cf46bee338304c5c8968fd7f132ba0d40c428b7 x_refsource_MISC
- https://github.com/python-pillow/Pillow/releases/tag/13.0.0 x_refsource_MISC
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-9v9v-9qvf-h2hj x_refsource_CONFIRM
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Details
- Published
- 2026-10-22
- Last updated
- 2026-10-28
- State
- Published
- Assigner (CNA)
- GitHub_M
Exploit prediction (EPSS)
0.38%
Probability of exploitation in 30 days
32.6%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- Proof of concept
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-125Out-of-bounds Read