CVE-2026-27024
Medium
Description
pypdf is a free and open-source pure-python PDF library. Prior to 6.7.1, an attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires accessing the children of a TreeObject, for example as part of outlines. This vulnerability is fixed in 6.7.1.
SeverityMedium
CVSS5.5
Exploit probability—
ProductPypdf
PublishedFeb 20, 2026
First seenFeb 20, 2026
Weakness typeCWE-835CWE-835
How to fix
Update
- pypdf_project pypdf6.7.1 or later
- pypdf6.7.1 or later
- py-pdf pypdf6.7.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| pypdf_project pypdf | v < 6.7.1 | 6.7.1 |
| pypdfPyPI | v < 6.7.1 | 6.7.1 |
| py-pdf pypdf | v < 6.7.1 | 6.7.1 |
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