CVE-2026-41168
Medium
Description
pypdf is a free and open-source pure-python PDF library. An attacker who uses a vulnerability present in versions prior to 6.10.1 can craft a PDF which leads to long runtimes. This requires cross-reference streams with wrong large `/Size` values or object streams with wrong large `/N` values. This has been fixed in pypdf 6.10.1. As a workaround, one may apply the changes from the patch manually.
SeverityMedium
CVSS5.3
Exploit probability—
ProductPypdf
PublishedApr 22, 2026
First seenApr 22, 2026
Weakness typeCWE-834CWE-834
How to fix
Update
- pypdf_project pypdf6.10.1 or later
- pypdf6.10.1 or later
- py-pdf pypdf6.10.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| pypdf_project pypdf | v < 6.10.1 | 6.10.1 |
| pypdfPyPI | v < 6.10.1 | 6.10.1 |
| py-pdf pypdf | v < 6.10.1 | 6.10.1 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.