CVE-2026-113793

UNKNOWN 0.0

pypdf: Possible infinite loop when removing tree items

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

pypdf is a free and open-source pure-python PDF library. Prior to 6.20.1, removing an object from a crafted cyclic PDF tree, such as an outline item, can enter an infinite loop and block the current process. This issue is fixed in version 6.20.1.

CWE	CWE-835
Vendor	py-pdf
Product	pypdf
Published	Oct 21, 2026

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Affected Versions

py-pdf / pypdf

< 6.20.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/py-pdf/pypdf/security/advisories/GHSA-9mx8-4j7g-633p github.com: https://github.com/py-pdf/pypdf/pull/4188 github.com: https://github.com/py-pdf/pypdf/commit/c9c35b4471c2eb5fe078094f6c816e69d4ed25a0 github.com: https://github.com/py-pdf/pypdf/releases/tag/6.20.1