CVE-2026-41312
Medium
Description
pypdf is a free and open-source pure-python PDF library. An attacker who uses a vulnerability present in versions prior to 6.10.2 can craft a PDF which leads to the RAM being exhausted. This requires accessing a stream compressed using `/FlateDecode` with a `/Predictor` unequal 1 and large predictor parameters. This has been fixed in pypdf 6.10.2. As a workaround, one may apply the changes from the patch manually.
SeverityMedium
CVSS6.5
Exploit probability13. percentile0.2%
ProductPypdf
PublishedApr 22, 2026
First seenApr 22, 2026
Weakness typeCWE-789CWE-789
How to fix
Update
- pypdf_project pypdf6.10.2 or later
- pypdf6.10.2 or later
- py-pdf pypdf6.10.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| pypdf_project pypdf | v < 6.10.2 | 6.10.2 |
| pypdfPyPI | v < 6.10.2 | 6.10.2 |
| py-pdf pypdf | v < 6.10.2 | 6.10.2 |
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