CVE-2026-103000
High
Description
pypdf is a free and open-source pure-python PDF library. Prior to 6.19.0, a crafted PDF can provide unusually large alphabetical page-label values that cause pypdf/_page_labels.py to generate strings beyond a reasonable page-label length when an application retrieves document page labels, consuming excessive memory and potentially making the application unavailable. This issue is fixed in version 6.19.0.
SeverityHigh
CVSS7.5
Exploit probability—
ProductPypdf
PublishedSep 30, 2026
First seenSep 30, 2026
Weakness typeCWE-400Uncontrolled resource consumption
How to fix
Update
- pypdf_project pypdf6.19.0 or later
- pypdf6.19.0 or later
- py-pdf pypdf6.19.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| pypdf_project pypdf | v < 6.19.0 | 6.19.0 |
| pypdfPyPI | v < 6.19.0 | 6.19.0 |
| py-pdf pypdf | v < 6.19.0 | 6.19.0 |
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