CVE-2026-59200CWE-400CWE-770

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

High · published July 14, 2026

CVSS v3.1
7.5
EPSS
0%
Percentile
31.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00385 · 31.4th percentile
Weaknesses
CWE-400 · Uncontrolled Resource Consumption; CWE-770 · Allocation of Resources Without Limits or Throttling
Published
2026-07-14T16:09Z
EPSS history
Timeline
  • 14 JUL 16:09Z
    Pillow: Decompression Bomb DoS via PdfParser.PdfStream.decode()
    cvelistv5