要点
- CVE-2026-84309 是影响 pypdf, pypdf (py-pdf) 的中危 (CVSS 5.5)漏洞。
- 未来 30 天内被利用的概率（EPSS）：0.19%，高于 8.3% 的漏洞。
- 修复：升级到 6.16.0 或更高版本。
| Package | Affected versions | Patched versions |
|---|
| pypdf PyPI | < 6.16.0
| 6.16.0
|
| pypdf | < 6.16.0
| 6.16.0
|
Description
Impact
An attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires a (usually writing) code path where TreeObject.insert_child is involved.
Patches
This has been fixed in pypdf==6.16.0.
Workarounds
If you cannot upgrade yet, consider applying the changes from PR #3964.
NVD description
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.
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