CVE-2026-57204
Medium
Description
pypdf is a free and open-source pure-python PDF library. Prior to 6.13.3, a maliciously crafted PDF can cause DoS. An attacker who uses this vulnerability can craft a PDF which leads to large memory usage, as MAX_DECLARED_STREAM_LENGTH is sometimes ignored. This requires parsing a content stream without a /Length value. This issue has been fixed in version 6.13.3.
SeverityMedium
CVSS6.5
Exploit probability—
ProductPypdf
PublishedJun 30, 2026
First seenJun 30, 2026
Weakness typeCWE-400Uncontrolled resource consumption
How to fix
Update
- pypdf_project pypdf6.13.3 or later
- pypdf6.13.3 or later
- py-pdf pypdf6.13.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| pypdf_project pypdf | v < 6.13.3 | 6.13.3 |
| pypdfPyPI | v < 6.13.3 | 6.13.3 |
| py-pdf pypdf | v < 6.13.3 | 6.13.3 |
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