CVE-2026-28351
Medium
Description
pypdf is a free and open-source pure-python PDF library. Prior to version 6.7.4, an attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing the content stream using the RunLengthDecode filter. This has been fixed in pypdf 6.7.4. As a workaround, consider applying the changes from PR #3664.
SeverityMedium
CVSS5.3
Exploit probability—
ProductPypdf
PublishedFeb 27, 2026
First seenFeb 27, 2026
Weakness typeCWE-400Uncontrolled resource consumption
How to fix
Update
- pypdf_project pypdf6.7.4 or later
- pypdf6.7.4 or later
- py-pdf pypdf6.7.4 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| pypdf_project pypdf | v < 6.7.4 | 6.7.4 |
| pypdfPyPI | v < 6.7.4 | 6.7.4 |
| py-pdf pypdf | v < 6.7.4 | 6.7.4 |
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