CVE-2026-59200
HIGHPillow: Decompression Bomb DoS via PdfParser.PdfStream.decode()
Title source: cnaDescription
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.
References (4)
Core 4
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/python-pillow/Pillow/security/advisories/GHSA-jjj6-mw9f-p565
X_Refsource_Misc x_refsource_misc
https://github.com/python-pillow/Pillow/pull/9718
X_Refsource_Misc x_refsource_misc
https://github.com/python-pillow/Pillow/commit/f7a31ea75e460e108c37126da1f47812f21f6b09
X_Refsource_Misc x_refsource_misc
https://github.com/python-pillow/Pillow/releases/tag/12.3.0
Scores
CVSS v3
7.5
EPSS
0.0039
EPSS Percentile
31.3%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-400
CWE-770
Status
published
Products (3)
pypi/Pillow
5.1.0 - 12.3.0PyPI
python/pillow
5.1.0 - 12.3.0
python-pillow/Pillow
>= 5.1.0, < 12.3.0
Published
Jul 14, 2026
Tracked Since
Jul 14, 2026