HOMEVULNERABILITIESCVE-2026-40192
HIGH

CVE-2026-40192

CWE-400Published: April 15, 2026· Updated: Apr 22, 2026

7.5
CVSS v3.1
EPSS:0.04%probability of exploitation in 30 daysPercentile:12.7th

Official 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.

NVD Source

Technical Analysis

CVE-2026-40192 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

Python1 product
pillow
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
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Official Patches & Advisories

PATCHhttps://github.com/python-pillow/Pillow/commit/3cb854e8b2bab43f40e342e665f9340d861aa628
PATCHhttps://github.com/python-pillow/Pillow/pull/9521
PATCHhttps://github.com/python-pillow/Pillow/security/advisories/GHSA-whj4-6x5x-4v2j

All References (4)

→
https://github.com/python-pillow/Pillow/commit/3cb854e8b2bab43f40e342e665f9340d861aa628Patch
→
https://github.com/python-pillow/Pillow/pull/9521Issue Tracking · Patch
→
https://github.com/python-pillow/Pillow/security/advisories/GHSA-whj4-6x5x-4v2jMitigation · Patch · Vendor Advisory
→
https://pillow.readthedocs.io/en/stable/releasenotes/12.2.0.html#prevent-fits-decompression-bombRelease Notes

Quick Facts

CVE IDCVE-2026-40192
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-400
CISA KEVNo
EPSS (30d)0.04%
Affected1 vendor
PublishedApr 15, 2026

Related CVEs (CWE-400)

CVE-2026-30141
9.8
CVE-2026-8856
9.1
CVE-2025-32424
8.7
CVE-2026-3505
8.7
CVE-2026-45169
8.7
CVE-2026-7790
8.7

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-40192 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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