CVE-2026-59197
Medium
Elevated severity or exploit probability.
CVSS base
8.2
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
EPSS — probability of exploitation (30 days)
0.4%
38.1th percentile
CISA KEV
Not listed
Weakness / dates
CWE-190
Published 2026-07-14 · modified 2026-07-21
CVSS breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
| Attack Vector | N | Network |
| Attack Complexity | L | Low |
| Privileges Required | N | None |
| User Interaction | N | None |
| Scope | U | Unchanged |
| Confidentiality | N | None |
| Integrity | L | Low |
| Availability | H | High |
Timeline
- 2026-07-14 — Published (NVD)
- 2026-07-21 — Last modified (NVD)
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.
Affected
References
- https://github.com/python-pillow/Pillow/commit/cce3bdb867c77a3420261ed1bfdb6b0787ec8fc1
- https://github.com/python-pillow/Pillow/pull/9695
- https://github.com/python-pillow/Pillow/releases/tag/12.3.0
- exploit https://github.com/python-pillow/Pillow/security/advisories/GHSA-xj96-63gp-2gmr
- exploit https://github.com/python-pillow/Pillow/security/advisories/GHSA-xj96-63gp-2gmr