Excessive Iteration Affecting pypdf package, versions [,6.21.2)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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-21663369
- published23 Oct 2026
- disclosed23 Oct 2026
- creditDuc Anh Luu
Introduced: 23 Oct 2026
NewCVE-2026-115580 (opens in a new tab)How to fix?
Upgrade pypdf to version 6.21.2 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 Excessive Iteration via _read_standard_xref_table in pypdf/_reader.py, where a PDF file containing a cross-reference (xref) table with a declared size far exceeding the actual file size causes unbounded memory allocation. An attacker can supply a malicious PDF to trigger this condition and crash the process.