This page tracks the Debian fix status. The vulnerability itself is described on the main CVE page.
View CVE-2026-59197 →
DEBIAN-CVE-2026-59197
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 l...
Original description
The description as published by the source.
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.
Source: OSV.dev (Open Source Vulnerabilities) OSV
Affected packages
Debian:12
pillow
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Debian:13
pillow
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Debian:14
pillow
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"12.3.0-1"}]}]
References
- advisory security-tracker.debian.org