CVE-2026-59937
High
Description
pypdf is a free and open-source pure-python PDF library. Prior to 6.14.0, an attacker can craft a PDF with repeated malformed cross-reference streams that cause pypdf to spend long runtimes recovering broken cross-reference table entries. This issue is fixed in version 6.14.0.
SeverityHigh
CVSS7.5
Exploit probability—
ProductPypdf
PublishedJul 8, 2026
First seenJul 8, 2026
Weakness typeCWE-400Uncontrolled resource consumption
How to fix
Update
- pypdf_project pypdf6.14.0 or later
- pypdf6.14.0 or later
- py-pdf pypdf6.14.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| pypdf_project pypdf | v < 6.14.0 | 6.14.0 |
| pypdfPyPI | v < 6.14.0 | 6.14.0 |
| py-pdf pypdf | v < 6.14.0 | 6.14.0 |
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