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CVE-2026-40192

Pillow is vulnerable to a FITS GZIP decompression bomb

Published: Apr 15, 2026Updated: Jul 20, 2026 Sources: CVE List NVD BDUCWE-400
7.5HIGH
NVD MITRE
EPSS Score
0.7%
Top 51.4%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-400CWE-770CWE-409

Affected Products

Red Hat Inc.
commercial·USaka red hat
Red Hat Enterprise LinuxOn-premOS
Operating Systems / linux-distro
Red Hat QuayOn-prem
Operating Systems / linux-distro
Red Hat SatelliteOn-prem
Operating Systems / linux-distro
OpenShift AIOn-prem
Operating Systems / linux-distro
Red Hat OpenShift LightspeedOn-prem
Operating Systems / linux-distro
Red Hat AI Inference ServerOn-prem
Operating Systems / linux-distro
Red Hat Enterprise Linux AIOn-prem
Operating Systems / linux-distro
Ansible Automation PlatformOn-prem
Operating Systems / linux-distro
python
oss-project·US
pillow
OSS Libraries
Canonical Ltd.
commercial·GBaka canonical
UbuntuOn-premOS
Operating Systems / linux-distro
Сообщество свободного программного обеспечения
oss-projectaka fsf
Debian GNU/LinuxOn-premOS
Operating Systems / linux-distro
Uploadcare, LLC
commercial
PillowLibrary
OSS Libraries / pypi
python-pillow
oss-projectaka pillow
PillowLibrary
OSS Libraries / pypi
and 1 more affected products View all →

Exploitability

Official Patch Available
Workaround Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

https://github.com/python-pillow/Pillow/commit/3cb854e8b2bab43f40e342e665f9340d861aa628
github.com
https://github.com/python-pillow/Pillow/pull/9521
github.com
https://github.com/python-pillow/Pillow/security/advisories/GHSA-whj4-6x5x-4v2j
github.com
and 32 more references View all →

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