Fluid Attacks Database

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.

Mitigation

Update Impact

Minimal update. May introduce new vulnerabilities or breaking changes.

Ecosystem	Package	Affected version	Patched versions
debian 13	pillow	=11.1.0-5 \|\| =11.1.0-5+deb13u1 \|\| >=0 <11.1.0-5+deb13u2	11.1.0-5+deb13u2
pypi	pillow	>=10.3.0 <12.2.0	12.2.0
debian 14	pillow	=11.1.0-5 \|\| =11.2.1-1 \|\| =11.3.0-1 \|\| =12.0.0-1 \|\| =12.1.0-1 \|\| =12.1.1-1 \|\| =12.1.1-2 \|\| >=0 <12.2.0-1	12.2.0-1
rpm rhel7	python-pillow	-	-
rpm rhel8	python-pillow	-	-

Aliases

1. CVE-2026-401922. NVD-2026-401923. OSV-DEBIAN-2026-401924. OSV-2026-401925. GHSA-whj4-6x5x-4v2j6. GCVE-2026-401927. SECURITY-TRACKER-CVE-2026-40192

References

1. https://github.com/python-pillow/Pillow/security/advisories/GHSA-whj4-6x5x-4v2j2. https://github.com/python-pillow/Pillow/pull/95213. https://github.com/python-pillow/Pillow/commit/3cb854e8b2bab43f40e342e665f9340d861aa6284. https://pillow.readthedocs.io/en/stable/releasenotes/12.2.0.html#prevent-fits-decompression-bomb

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