Allocation of Resources Without Limits or Throttling Affecting pypdf package, versions [,6.8.0)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
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-15457706
- published11 Mar 2026
- disclosed11 Mar 2026
- crediticonnnjka
Introduced: 11 Mar 2026
NewCVE-2026-31826 (opens in a new tab)How to fix?
Upgrade pypdf to version 6.8.0 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 in read_from_stream(), when parsing PDF content streams. An attacker can consume excessive memory by providing a content stream with an excessive declared /Length value, even if the data length is not excessive.
Note: The project maintainers note that "As far as we are aware, this mostly affects reading from buffers of unknown size, as returned by open("file.pdf", mode="rb") for example. Passing a file path or a BytesIO buffer to pypdf instead does not seem to trigger the vulnerability."