CVE-2026-84309
NoneCVSS
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EPSS
0.2%
Published
Sep 1, 2026
CISA due date
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The record
pypdf is a free and open-source pure-python PDF library. Prior to 6.16.0, an attacker can craft a PDF whose cyclic tree structure causes pypdf/generic/_data_structures.py TreeObject.insert_child to follow /Next links indefinitely when a writing code path inserts a child, producing an infinite loop. This issue is fixed in version 6.16.0.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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