high7.5
CVE-2026-59205
Pillow: Controlled heap out-of-bounds write in Pillow `ImageCmsTransform.apply()` via output mode mismatch
Impact
Pillow is a Python imaging library. Prior to 12.3.0, Pillow's ImageCms.ImageCmsTransform.apply(im, imOut) API can trigger controlled native heap corruption when the caller supplies an output image whose mode does not match the transform's declared output mode. This issue is fixed in version 12.3.0.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | pillow | < 12.3.0 | 12.3.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Python | Pillow | before 12.3.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-9hw9-ch79-4vh6
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-9hw9-ch79-4vh6
- https://nvd.nist.gov/vuln/detail/CVE-2026-59205
- https://github.com/python-pillow/Pillow/pull/9715
- https://github.com/python-pillow/Pillow/commit/a9ffc42bedf4fc0a7ef8d6486e7f9e81e3397721
- https://github.com/pypa/advisory-database/tree/main/vulns/pillow/PYSEC-2026-3453.yaml
- https://github.com/python-pillow/Pillow/releases/tag/12.3.0