CVE-2026-40192
High
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.
SeverityHigh
CVSS7.5
Exploit probability—
Product
Python Pillow
PublishedApr 15, 2026
First seenApr 15, 2026
How to fix
Update
- python pillow12.2.0 or later
- pillow12.2.0 or later
Vendor advisories
- access.redhat.com/errata/RHSA-2026:24761
- access.redhat.com/errata/RHSA-2026:27076
- access.redhat.com/errata/RHSA-2026:24762
- access.redhat.com/errata/RHSA-2026:34366
- access.redhat.com/errata/RHSA-2026:34368
- access.redhat.com/errata/RHSA-2026:34365
- access.redhat.com/errata/RHSA-2026:61628
- access.redhat.com/errata/RHSA-2026:61627
- access.redhat.com/errata/RHSA-2026:61629
- access.redhat.com/errata/RHSA-2026:16008
- access.redhat.com/errata/RHSA-2026:16030
- access.redhat.com/errata/RHSA-2026:16009
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| python pillow | 10.3.0 ≤ v < 12.2.0 | 12.2.0 |
| pillowPyPI | 10.3.0 ≤ v < 12.2.0 | 12.2.0 |
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