CVE-2026-59200
Pillow: Decompression Bomb DoS via PdfParser.PdfStream.decode()
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-400 CWE-770 |
| Vendor | python-pillow |
| Product | pillow |
| Published | Jul 14, 2026 |
| Last Updated | Jul 14, 2026 |
Stay Ahead of the Next One
Get instant alerts for python-pillow pillow
Be the first to know when new high vulnerabilities affecting python-pillow pillow are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
python-pillow / Pillow
>= 5.1.0, < 12.3.0
References
github.com: 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: https://github.com/python-pillow/Pillow/releases/tag/12.3.0