CVE-2026-59200

Pillow: Decompression Bomb DoS via PdfParser.PdfStream.decode()

Published: Jul 14, 2026Updated: Jul 21, 2026 Sources: CVE List NVDCWE-400

7.5HIGH

Description

Pillow is a Python imaging library. From 5.1.0 until 12.3.0, PdfParser.PdfStream.decode() in PIL/PdfParser.py calls zlib.decompress() with bufsize set to the PDF stream Length field without bounding the decompressed output size, allowing a crafted FlateDecode PDF stream to exhaust memory from a small file. This issue is fixed in version 12.3.0.

No summary for this CVE yet.

CVSS Vector Breakdown

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-400 CWE-770

Affected Products

python-pillow

oss-projectaka pillow

PillowLibrary

oss-project·US

Exploitability

Official Patch Available

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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique

Impact

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References

https://github.com/python-pillow/Pillow/security/advisories/GHSA-jjj6-mw9f-p565

github.com

https://github.com/python-pillow/Pillow/pull/9718

github.com

https://github.com/python-pillow/Pillow/commit/f7a31ea75e460e108c37126da1f47812f21f6b09

github.com

and 1 more references View all →

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