CVE-2026-48156
Low
Description
pypdf is a free and open-source pure-python PDF library. Prior to 6.12.0, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires cross-reference streams with /W [0 0 0] values and large /Size values. This vulnerability is fixed in 6.12.0.
SeverityLow
CVSS3.3
Exploit probability—
ProductPypdf
PublishedMay 28, 2026
First seenMay 28, 2026
Weakness typeCWE-834CWE-834
How to fix
Update
- pypdf_project pypdf6.12.0 or later
- pypdf6.12.0 or later
- py-pdf pypdf6.12.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| pypdf_project pypdf | v < 6.12.0 | 6.12.0 |
| pypdfPyPI | v < 6.12.0 | 6.12.0 |
| py-pdf pypdf | v < 6.12.0 | 6.12.0 |
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