CVE-2026-31826
Medium
Description
pypdf is a free and open-source pure-python PDF library. Prior to 6.8.0, an attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing a content stream with a rather large /Length value, regardless of the actual data length inside the stream. This vulnerability is fixed in 6.8.0.
SeverityMedium
CVSS5.5
Exploit probability—
ProductPypdf
PublishedMar 10, 2026
First seenMar 10, 2026
Weakness typeCWE-770Allocation of resources without limits
How to fix
Update
- pypdf_project pypdf6.8.0 or later
- pypdf6.8.0 or later
- py-pdf pypdf6.8.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| pypdf_project pypdf | v < 6.8.0 | 6.8.0 |
| pypdfPyPI | v < 6.8.0 | 6.8.0 |
| py-pdf pypdf | v < 6.8.0 | 6.8.0 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.