CVE-2026-59200 | THREATINT

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.

PUBLISHED Reserved 2026-07-02 | Published 2026-07-14 | Updated 2026-07-14 | Assigner GitHub_M

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

Problem types

CWE-400: Uncontrolled Resource Consumption

CWE-770: Allocation of Resources Without Limits or Throttling

Product status

>= 5.1.0, < 12.3.0

affected

References

github.com/...Pillow/security/advisories/GHSA-jjj6-mw9f-p565 exploit

github.com/...Pillow/security/advisories/GHSA-jjj6-mw9f-p565

github.com/python-pillow/Pillow/pull/9718

github.com/...ommit/f7a31ea75e460e108c37126da1f47812f21f6b09

github.com/python-pillow/Pillow/releases/tag/12.3.0

cve.org (CVE-2026-59200)

nvd.nist.gov (CVE-2026-59200)

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