Infinite loop Affecting pypdf package, versions [,6.16.0)
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-19500565
- published2 Sept 2026
- disclosed1 Sept 2026
- creditErick Alex
Introduced: 1 Sep 2026
NewCVE-2026-84309 (opens in a new tab)How to fix?
Upgrade pypdf to version 6.16.0 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 Infinite loop in the insert_child method of TreeObject, whose loop can fail to reach its exit condition. An attacker can hang the process indefinitely by supplying a PDF whose outline tree structure is processed through TreeObject.insert_child. This is reached only through write code paths that call TreeObject.insert_child on an attacker-supplied PDF.