Pillow: Decompression Bomb DoS via PdfParser.PdfStream.decode()
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.
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-59200US | — | — | ||
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 fiel… | ||||
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references
External citations — patches, advisories, analysis.
- https://github.com/python-pillow/Pillow/commit/f7a31ea75e460e108c37126da1f47812f21f6b09FIX
- https://github.com/python-pillow/Pillow/pull/9718FIX
- https://github.com/python-pillow/Pillow/releases/tag/12.3.0ARTICLE
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-jjj6-mw9f-p565ADVISORY
- https://nvd.nist.gov/vuln/detail/CVE-2026-59200WEB
scry
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