CVE-2026-84311
Low
Description
pypdf is a free and open-source pure-python PDF library. Prior to 6.16.1, an attacker can craft a PDF that causes pypdf/_page.py PageObject._extract_text and PageObject.extract_xform_text to traverse a directed acyclic graph of reused form XObjects in which each form invokes a child multiple times, creating exponentially many traversal paths and causing long runtimes and large memory consumption. This issue is fixed in version 6.16.1.
SeverityLow
CVSS3.3
Exploit probability—
ProductPypdf
PublishedSep 1, 2026
First seenSep 1, 2026
Weakness typeCWE-834CWE-834
How to fix
Update
- pypdf_project pypdf6.16.1 or later
- pypdf6.16.1 or later
- py-pdf pypdf6.16.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| pypdf_project pypdf | v < 6.16.1 | 6.16.1 |
| pypdfPyPI | v < 6.16.1 | 6.16.1 |
| py-pdf pypdf | v < 6.16.1 | 6.16.1 |
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