CVE-2026-115580
High
Description
pypdf is a free and open-source pure-python PDF library. Prior to 6.21.2, an attacker can craft a PDF with a standard cross-reference table whose declared entry count exceeds what the file can contain, causing excessive processing and long runtimes when the file is opened. This issue is fixed in version 6.21.2.
SeverityHigh
CVSS7.1
Exploit probability—
ProductPypdf
PublishedOct 23, 2026
First seenOct 23, 2026
Weakness typeCWE-834CWE-834
How to fix
Update
- pypdf6.21.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| pypdfPyPI | v < 6.21.2 | 6.21.2 |
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