XML Entity Expansion Affecting pypdf package, versions [,6.10.0)
Threat Intelligence
Exploit Maturity
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
Proof of Concept
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-PYTHON-PYPDF-15989793
- published12 Apr 2026
- disclosed10 Apr 2026
- creditkodareef5
Introduced: 10 Apr 2026
NewCVE-2026-40260 (opens in a new tab)Common Vulnerabilities and Exposures (CVE) are common identifiers for publicly known security vulnerabilities
Common Weakness Enumeration (CWE) is a category system for software weaknesses
How to fix?
Upgrade pypdf to version 6.10.0 or higher.
Overview
pypdf is an A pure-python PDF library capable of splitting, merging, cropping, and transforming PDF files
Affected versions of this package are vulnerable to XML Entity Expansion when parsing XMP metadata. An attacker can cause excessive memory consumption with excessive DOCTYPE entity declarations.