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

MITRE NVD CVE.ORG JSON API Print: PDF PDF

Summary

CVECVE-2026-59200
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-14 17:17:14 UTC
Updated2026-07-14 20:18:07 UTC
DescriptionPillow 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-400 | CWE-770 | CWE-400 CWE-400: Uncontrolled Resource Consumption | CWE-770 CWE-770: Allocation of Resources Without Limits or Throttling

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Python-pillow Pillow affected >= 5.1.0, < 12.3.0 Not specified

References

ReferenceSourceLinkTags
github.com/python-pillow/Pillow/commit/f7a31ea75e460e108c37126da1f47812f... [email protected] github.com
github.com/python-pillow/Pillow/pull/9718 [email protected] github.com
github.com/python-pillow/Pillow/security/advisories/GHSA-jjj6-mw9f-p565 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/python-pillow/Pillow/releases/tag/12.3.0 [email protected] github.com
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