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-22132195
- published2 Nov 2026
- disclosed30 Oct 2026
- creditPablo Alaniz
Introduced: 30 Oct 2026
NewCVE-2026-119209 (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 _read_pdf15_xref_stream in pypdf/_reader.py when parsing a PDF containing highly compressible cross-reference (xref) streams. An attacker can craft a PDF where xref streams declare millions of entries within normal stream size bounds, and chain multiple streams via /Prev to multiply the effect, causing unbounded memory and CPU consumption that crashes the process. Additionally, negative /Index counts were accepted, allowing bypass of the existing per-stream entry clamp.