Allocation of Resources Without Limits or Throttling Affecting pypdf package, versions [,6.19.0)
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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- published3 Oct 2026
- disclosed1 Oct 2026
- creditUnknown
Introduced: 1 Oct 2026
NewCVE-2026-103000 (opens in a new tab)How to fix?
Upgrade pypdf to version 6.19.0 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 Allocation of Resources Without Limits or Throttling via number2uppercase_letter (and its lowercase counterpart) in _page_labels.py when processing a PDF with a large alphabetical page label index. Because no upper bound is enforced on the repetition count before constructing the label string, an attacker can supply a PDF whose page label numbering scheme maps to an arbitrarily large integer, causing the process to allocate an unbounded string and crash the application.