CVE-2026-59200

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

State: Published
Severity: 7.5 High
Published: Jul 14, 2026
Updated: Jul 14, 2026
Reserved: Jul 2, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	GitHub_M

Weaknesses

CWE-400 Uncontrolled Resource Consumption
CWE-770 Allocation of Resources Without Limits or Throttling

Affected Products

Product	Versions
Pillowpython-pillow	>= 5.1.0, < 12.3.0Affected

References

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