CVE-2026-119206
High
Description
pypdf is a free and open-source pure-python PDF library. Prior to 6.21.3, pypdf can take excessive time to retrieve page labels from a crafted PDF containing a flat page-label number tree with many ranges. The page_labels property resolves each page independently and repeatedly scans the same /Nums array from the beginning, causing work to grow with both the page count and the number of label ranges. This issue is fixed in version 6.21.3.
SeverityHigh
CVSS5.5
Exploit probability—
ProductPy-pdf Pypdf
PublishedOct 29, 2026
First seenNov 4, 2026
Weakness typeCWE-400Uncontrolled resource consumption
How to fix
Update
- py-pdf pypdf6.21.3 or later
- pypdf6.21.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| py-pdf pypdf | v < 6.21.3 | 6.21.3 |
| pypdfPyPI | v < 6.21.3 | 6.21.3 |
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