CVE-2026-113789
Medium
Description
pypdf is a free and open-source pure-python PDF library. Prior to 6.21.0, an attacker can craft a PDF that causes large memory usage or long runtimes when an application retrieves the document's form fields. This issue is fixed in version 6.21.0.
SeverityMedium
CVSS6.0
Exploit probability—
ProductPypdf
PublishedOct 21, 2026
First seenOct 21, 2026
How to fix
Update
- pypdf6.21.0 or later
- py-pdf pypdf6.21.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| pypdfPyPI | v < 6.21.0 | 6.21.0 |
| py-pdf pypdf | v < 6.21.0 | 6.21.0 |
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