CVE-2026-59200

HighCVSS 7.5/10Last modified Oct 24, 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.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-400 CWE-770

Affected software

Vendor	Product	Versions
python-pillow	Pillow	>= 5.1.0, < 12.3.0

References

https://github.com/python-pillow/Pillow/commit/f7a31ea75e460e108c37126da1f47812f21f6b09Patch
https://github.com/python-pillow/Pillow/pull/9718Issue Tracking, Patch
https://github.com/python-pillow/Pillow/releases/tag/12.3.0Release Notes
https://github.com/python-pillow/Pillow/security/advisories/GHSA-jjj6-mw9f-p565Exploit, Vendor Advisory
https://github.com/python-pillow/Pillow/security/advisories/GHSA-jjj6-mw9f-p565Exploit, Vendor Advisory

Timeline

Published: Jul 14, 2026
Last modified: Oct 24, 2026
NVD status: Analyzed

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