CVE-2026-59205
Pillow: Controlled heap out-of-bounds write in `ImageCmsTransform.apply()` via output mode mismatch
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-787 |
| Vendor | python-pillow |
| Product | pillow |
| Published | Jul 14, 2026 |
| Last Updated | Jul 14, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
python-pillow / Pillow
< 12.3.0
References
github.com: https://github.com/python-pillow/Pillow/security/advisories/GHSA-9hw9-ch79-4vh6 github.com: https://github.com/python-pillow/Pillow/pull/9715 github.com: https://github.com/python-pillow/Pillow/commit/a9ffc42bedf4fc0a7ef8d6486e7f9e81e3397721 github.com: https://github.com/python-pillow/Pillow/releases/tag/12.3.0