8.2
High
CVE-2026-96640 Pillow is a Python imaging library
Description
Pillow is a Python imaging library. From 5.1.0 until 13.0.0, PdfParser.linearize_page_tree() in src/PIL/PdfParser.py treats a PDF /Pages graph as a tree without tracking duplicate indirect references. When Image.save(..., format="PDF", append=True) processes an attacker-controlled existing PDF whose /Kids arrays repeatedly reference the same child /Pages node, Pillow expands the shared subtree as distinct pages. A compact malformed PDF can therefore create exponentially many page references and consume disproportionate CPU before the append completes. This issue is fixed in version 13.0.0.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Pillow 5.1 | 5.1.0 → < 13.0.0 | 13.0.0 |
References
- github.com github.com
- github.com github.com
- github.com github.com
- github.com github.com
Timeline
- Published
- Last modified
Other CVEs of Pillow
The 60 CVEs of Pillow →
CVE-2026-112902
Pillow: Memory disclosure and segfault in libtiff encoder via crafted TIFF tags
8.3
High
CVE-2026-112899
Pillow: EPS load(scale) lets Ghostscript render past the decompression bomb limit
6.3
Medium
CVE-2026-114501
Pillow is a Python imaging library
6.3
Medium
CVE-2026-96639
Pillow is a Python imaging library
9.8
Critical