# CVE-2026-40192: pillow: Pillow is a Python imaging library

CVE-2026-40192 is fixed in 4 products on 1 platform, first by python3-pil 12.1.1-2ubuntu1.1, released April 16, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-40192
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0067
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 15, 2026

## Description

Pillow is a Python imaging library. Versions 10.3.0 through 12.1.1 did not limit the amount of GZIP-compressed data read when decoding a FITS image, making them vulnerable to decompression bomb attacks. A specially crafted FITS file could cause unbounded memory consumption, leading to denial of service (OOM crash or severe performance degradation). If users are unable to immediately upgrade, they should only open specific image formats, excluding FITS, as a workaround.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | pillow Debian 13.5 (trixie) | 11.1.0-5+deb13u2 | [DEBIAN-CVE-2026-40192](https://patchblox.com/security/data/fix/linux/debian-cve-2026-40192.md) | May 15, 2026 |
| Linux | pillow Debian 14 | 12.2.0-1 | [DEBIAN-CVE-2026-40192](https://patchblox.com/security/data/fix/linux/debian-cve-2026-40192.md) | May 15, 2026 |
| Linux | python-Pillow opensuse-leap 16.0 | 11.3.0-160000.4.1 | [OPENSUSE-SU-2026:20617-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20617-1.md) | Apr 22, 2026 |
| Linux | python3-pil Ubuntu 25.10 (questing) | 11.3.0-1ubuntu1.2 | [python3-pil 11.3.0-1ubuntu1.2](https://patchblox.com/security/data/fix/linux/ubuntu-questing-python3-pil-11.3.0-1ubuntu1.2.md) | May 15, 2026 |
| Linux | python3-pil Ubuntu 26.04.1 LTS (resolute) | 12.1.1-2ubuntu1.1 | [python3-pil 12.1.1-2ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-python3-pil-12.1.1-2ubuntu1.1.md) | Apr 16, 2026 |
| Linux | python3-pil.imagetk Ubuntu 25.10 (questing) | 11.3.0-1ubuntu1.2 | [python3-pil.imagetk 11.3.0-1ubuntu1.2](https://patchblox.com/security/data/fix/linux/ubuntu-questing-python3-pil.imagetk-11.3.0-1ubuntu1.2.md) | May 15, 2026 |
| Linux | python3-pil.imagetk Ubuntu 26.04.1 LTS (resolute) | 12.1.1-2ubuntu1.1 | [python3-pil.imagetk 12.1.1-2ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-python3-pil.imagetk-12.1.1-2ubuntu1.1.md) | Apr 16, 2026 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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