CVE-2026-40192

HIGH8.7

Pillow is vulnerable to a FITS GZIP decompression bomb

Published Apr 15, 2026

Modified 6 days ago

Details

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

WEB

https://github.com/python-pillow/Pillow/commit/3cb854e8b2bab43f40e342e665f9340d861aa628

WEB

https://github.com/python-pillow/Pillow/pull/9521

WEB

https://github.com/python-pillow/Pillow/security/advisories/GHSA-whj4-6x5x-4v2j

WEB

https://pillow.readthedocs.io/en/stable/releasenotes/12.2.0.html#prevent-fits-decompression-bomb

ADVISORY

https://www.cve.org/CVERecord?id=CVE-2026-40192

CVSS Analysis