CVE-2026-84311

UNKNOWN 0.0

pypdf: Possible long runtimes/large memory usage when extracting XForm objects

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

pypdf is a free and open-source pure-python PDF library. Prior to 6.16.1, an attacker can craft a PDF that causes pypdf/_page.py PageObject._extract_text and PageObject.extract_xform_text to traverse a directed acyclic graph of reused form XObjects in which each form invokes a child multiple times, creating exponentially many traversal paths and causing long runtimes and large memory consumption. This issue is fixed in version 6.16.1.

CWE	CWE-834
Vendor	py-pdf
Product	pypdf
Published	Sep 1, 2026

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Affected Versions

py-pdf / pypdf

< 6.16.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/py-pdf/pypdf/security/advisories/GHSA-763m-79hh-57f2 github.com: https://github.com/py-pdf/pypdf/pull/3966 github.com: https://github.com/py-pdf/pypdf/commit/d91ab705fd81ed1a9cec175c6958600dea1a4942 github.com: https://github.com/py-pdf/pypdf/releases/tag/6.16.1