CVE-2026-40192

HIGH

Pillow is vulnerable to a FITS GZIP decompression bomb

Title source: cna
STIX 2.1

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.

References (30)

Core 30
Core References
X_Refsource_Misc x_refsource_misc
https://github.com/python-pillow/Pillow/pull/9521

Scores

CVSS v3 7.5
EPSS 0.0067
EPSS Percentile 48.4%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-400 CWE-409 CWE-770
Status published
Products (3)
pypi/pillow 10.3.0 - 12.2.0PyPI
python/pillow 10.3.0 - 12.2.0
python-pillow/Pillow >= 10.3.0, < 12.2.0
Published Apr 15, 2026
Tracked Since Apr 16, 2026