CVE-2026-59197
Publication date 14 July 2026
Last updated 4 November 2026
Ubuntu priority
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.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| pillow | 26.10 stonking |
Not affected
|
| 26.04 LTS resolute |
Fixed in 12.1.1-2ubuntu1.4
|
|
| 24.04 LTS noble |
Fixed in 10.2.0-1ubuntu1.4
|
|
| 22.04 LTS jammy |
Fixed in 9.0.1-1ubuntu0.6
|
|
| 20.04 LTS focal |
Needs evaluation
|
|
| 18.04 LTS bionic |
Needs evaluation
|
|
| 16.04 LTS xenial |
Needs evaluation
|
|
| 14.04 LTS trusty |
Needs evaluation
|
|
| pillow-python2 | 26.10 stonking | Not in release |
| 26.04 LTS resolute | Not in release | |
| 24.04 LTS noble | Not in release | |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal |
Needs evaluation
|
Severity score breakdown
CVSS version: CVSS v3.0
Base score
8.2 · High
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
References
Related Ubuntu Security Notices (USN)
- USN-8999-1
- Pillow vulnerabilities
- 4 November 2026