Memory Allocation with Excessive Size Value 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-18592445
- published8 Aug 2026
- disclosed7 Aug 2026
- creditstefan6419846
Introduced: 7 Aug 2026
NewCVE-2026-71870 (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 Memory Allocation with Excessive Size Value in the parsing of the /ToUnicode entry of a font with unusually large values. An attacker can cause excessive memory consumption by crafting a PDF file with a large /ToUnicode stream and triggering text extraction.
Workaround
This vulnerability can be mitigated by applying the changes from PR #3944.