CVE-2026-33699
High
Description
pypdf is a free and open-source pure-python PDF library. Versions prior to 6.9.2 have a vulnerability in which an attacker can craft a PDF which leads to an infinite loop. This requires reading a file in non-strict mode. This has been fixed in pypdf 6.9.2. If users cannot upgrade yet, consider applying the changes from the patch manually.
SeverityHigh
CVSS7.5
Exploit probability—
ProductPypdf
PublishedMar 27, 2026
First seenMar 27, 2026
Weakness typeCWE-835CWE-835
How to fix
Update
- pypdf_project pypdf6.9.2 or later
- pypdf6.9.2 or later
- py-pdf pypdf6.9.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| pypdf_project pypdf | v < 6.9.2 | 6.9.2 |
| pypdfPyPI | v < 6.9.2 | 6.9.2 |
| py-pdf pypdf | v < 6.9.2 | 6.9.2 |
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.