CVE-2026-33123
Medium
Description
pypdf is a free and open-source pure-python PDF library. Versions prior to 6.9.1 allow an attacker to craft a malicious PDF which leads to long runtimes and/or large memory usage. Exploitation requires accessing an array-based stream with many entries. This issue has been fixed in version 6.9.1.
SeverityMedium
CVSS6.5
Exploit probability—
ProductPypdf
PublishedMar 20, 2026
First seenMar 20, 2026
How to fix
Update
- pypdf_project pypdf6.9.1 or later
- pypdf6.9.1 or later
- py-pdf pypdf6.9.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| pypdf_project pypdf | v < 6.9.1 | 6.9.1 |
| pypdfPyPI | v < 6.9.1 | 6.9.1 |
| py-pdf pypdf | v < 6.9.1 | 6.9.1 |
Check your version
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