CVE-2026-84310
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/_doc_common.py _get_outline to consume long runtimes and large amounts of memory when retrieving document outlines with large numbers of entries or deeply nested reused paths because the traversal lacked global entry-count and nesting-depth limits. This issue is fixed in version 6.16.1.
SeverityLow
CVSS3.3
Exploit probability—
ProductPypdf
PublishedSep 1, 2026
First seenSep 1, 2026
Weakness typeCWE-405CWE-405CWE-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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