CVE-2026-27888
High
Description
pypdf is a free and open-source pure-python PDF library. Prior to 6.7.3, an attacker who uses this vulnerability can craft a PDF which leads to the RAM being exhausted. This requires accessing the `xfa` property of a reader or writer and the corresponding stream being compressed using `/FlateDecode`. This has been fixed in pypdf 6.7.3. As a workaround, apply the patch manually.
SeverityHigh
CVSS7.5
Exploit probability—
ProductPypdf
PublishedFeb 26, 2026
First seenFeb 26, 2026
Weakness typeCWE-400Uncontrolled resource consumption
How to fix
Update
- pypdf_project pypdf6.7.3 or later
- pypdf6.7.3 or later
- py-pdf pypdf6.7.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| pypdf_project pypdf | v < 6.7.3 | 6.7.3 |
| pypdfPyPI | v < 6.7.3 | 6.7.3 |
| py-pdf pypdf | v < 6.7.3 | 6.7.3 |
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