CVE-2026-113792

EUVD-2026-107333
pypdf is a free and open-source pure-python PDF library. Prior to 6.20.1, calling PdfWriter.find_outline_item on a crafted PDF with a cyclic outline hierarchy can enter an infinite loop and block the current process. This issue is fixed in version 6.20.1.
Infinite Loop
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
UNKNOWN
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Awaiting analysis
This vulnerability is currently awaiting analysis.
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Common Weakness Enumeration
References
https://github.com/py-pdf/pypdf/commit/c9c35b4471c2eb5fe078094f6c816e69d4ed25a0
https://github.com/py-pdf/pypdf/pull/4188
https://github.com/py-pdf/pypdf/releases/tag/6.20.1
https://github.com/py-pdf/pypdf/security/advisories/GHSA-qfv9-64jg-mh7p