VDB
CVE-2026-96644
CVE-2026-96644
PUBLISHED
CVSS 7.1 HIGH
Reported by GitHub_M · Published October 21, 2026
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.
Risk Scores
CVSS 4.0
7.1
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 |
|---|---|---|
| python-pillow | Pillow | < 13.0.0 |
| chainguard | superset-fips-6.1 | 0 |
| PyPI | Pillow | 0 |
| python-pillow | Pillow | 0 |
| chainguard | nemo-gym | 0 |
| chainguard | nemo-rl-cuda-13.0 | 0 |
| chainguard | py3-pytorch-cuda-13.0 | 0 |
Timeline
- Oct 21, 2026 CVE Published
- Oct 22, 2026 EPSS Score
- Oct 22, 2026 Coalition ESS Score
- Oct 25, 2026 EPSS Score
- Oct 27, 2026 EPSS Score
- Oct 28, 2026 CVE Updated
- Oct 29, 2026 EPSS Score
- Oct 30, 2026 Security Advisory
References
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-9v9v-9qvf-h2hj x_refsource_CONFIRM
- 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://nvd.nist.gov/vuln/detail/CVE-2026-96644 advisory
- https://github.com/advisories/GHSA-9v9v-9qvf-h2hj advisory