CVE-2026-96639
Pillow is a Python imaging library.
- Severity: Critical
- CVSS 9.8
- EPSS 0.56%
- P2 · This week
Why P2: this week.
Description
Pillow is a Python imaging library. From 11.0.0 until 13.0.0, multi-frame loaders can retain an ImagingCore allocation created for a narrow frame mode while a later frame of the same dimensions changes the logical mode and decoder tiles to wider RGB or CMYK data. ImageFile.load_prepare() reuses the stale native storage because _im is non-null without verifying that its mode and size still match. Crafted PSD, MPO, DCX, or MIC frame transitions can then write wider pixels into the narrow allocation, causing native out-of-bounds writes and crashes. The MPO path can also cause a native over-read and, in demonstrated runtime-specific profiles, command execution. This issue is fixed in version 13.0.0.
Affected products
- pip Pillow >= 11.0.0, < 13.0.0; first patched: 13.0.0
Weakness
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References
- NVD record NVD
- CVE Program record CVE Program
- Reference NVD
- Reference NVD
- Reference NVD
- Reference NVD
- GitHub security advisory GitHub