Pillow is a Python imaging library. Prior to 12.3.0, Pillow's public rank-filter API can trigger a native heap out-of-bounds write when given a very large odd filter size because ImageFilter.RankFilter.filter() calls image.expand(size // 2, size // 2) before rank-filter size validation and ImagingExpand() computes output dimensions with unchecked signed int arithmetic. This issue is fixed in version 12.3.0.
Advisories
| Source | ID | Title |
|---|---|---|
Github GHSA |
GHSA-xj96-63gp-2gmr | Pillow: Heap out-of-bounds write in `ImageFilter.RankFilter` via integer overflow in `ImagingExpand` |
Fixes
Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
References
History
Tue, 21 Jul 2026 19:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
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Fri, 17 Jul 2026 00:15:00 +0000
| Type | Values Removed | Values Added |
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| References |
| |
| Metrics |
threat_severity
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threat_severity
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Tue, 14 Jul 2026 17:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Python-pillow
Python-pillow pillow |
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| Vendors & Products |
Python-pillow
Python-pillow pillow |
Tue, 14 Jul 2026 16:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | Pillow is a Python imaging library. Prior to 12.3.0, Pillow's public rank-filter API can trigger a native heap out-of-bounds write when given a very large odd filter size because ImageFilter.RankFilter.filter() calls image.expand(size // 2, size // 2) before rank-filter size validation and ImagingExpand() computes output dimensions with unchecked signed int arithmetic. This issue is fixed in version 12.3.0. | |
| Title | Pillow: Heap out-of-bounds write in Pillow `ImageFilter.RankFilter` via integer overflow in `ImagingExpand` | |
| Weaknesses | CWE-190 CWE-787 |
|
| References |
| |
| Metrics |
cvssV3_1
|
Projects
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Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-07-21T18:50:40.019Z
Reserved: 2026-07-02T19:53:48.831Z
Link: CVE-2026-59197
Updated: 2026-07-21T18:50:15.480Z
No data.
OpenCVE Enrichment
Updated: 2026-07-23T02:30:07Z
Github GHSA