Excessive Iteration Affecting pypdf package, versions [,6.16.1)
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.
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Test your applications- Snyk IDSNYK-PYTHON-PYPDF-19499097
- published2 Sept 2026
- disclosed1 Sept 2026
- creditKim HyunSung
Introduced: 1 Sep 2026
NewCVE-2026-84310 (opens in a new tab)How to fix?
Upgrade pypdf to version 6.16.1 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 in its document outline retrieval, which processes outline entries and nested outline paths without bounding the work done. An attacker can cause prolonged execution and large memory usage by supplying a PDF whose outline holds a very large number of entries, or nested outlines with long re-used nesting paths. This requires the application to retrieve the outline of an attacker-supplied PDF.