Inefficient Algorithmic Complexity Affecting pypdf package, versions [,6.15.0)
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-19477040
- published1 Sept 2026
- disclosed1 Sept 2026
- creditarpitjain099
Introduced: 1 Sep 2026
NewCVE-2026-82398 (opens in a new tab)How to fix?
Upgrade pypdf to version 6.15.0 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 Inefficient Algorithmic Complexity in read_until_whitespace in pypdf/_utils.py. An attacker can trigger long runtimes by supplying a PDF stream that calls this helper on a long run of bytes without whitespace. This makes parsing hang or slow to a crawl while the library scans and accumulates the input one byte at a time, delaying or blocking processing of the document.