Allocation of Resources Without Limits or Throttling Affecting pypdf package, versions [,6.21.3)
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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Start learning- Snyk IDSNYK-PYTHON-PYPDF-22132197
- published2 Nov 2026
- disclosed30 Oct 2026
- creditrozzkml
Introduced: 30 Oct 2026
NewCVE-2026-119206 (opens in a new tab)How to fix?
Upgrade pypdf to version 6.21.3 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 Allocation of Resources Without Limits or Throttling via the page_labels property in pypdf/_doc_common.py, which calls index2label once per page and each call scans the /Nums array from the beginning. An attacker can supply a PDF with a large number of pages and a flat /Nums page-label number tree, causing the label-building loop to execute in O(pages × label-ranges) time and exhaust CPU resources.