Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Python | Pillow | >= 5.1.0, < 12.3.0 |
Related Weaknesses (CWE)
References
- https://github.com/python-pillow/Pillow/commit/f7a31ea75e460e108c37126da1f47812fPatch
- https://github.com/python-pillow/Pillow/pull/9718Issue TrackingPatch
- https://github.com/python-pillow/Pillow/releases/tag/12.3.0Release Notes
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-jjj6-mw9f-p565ExploitVendor Advisory
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-jjj6-mw9f-p565ExploitVendor Advisory
FAQ
What is CVE-2026-59200?
CVE-2026-59200 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 t...
How severe is CVE-2026-59200?
CVE-2026-59200 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-59200?
Check the references section above for vendor advisories and patch information. Affected products include: Python Pillow.