CVE-2026-113792

pypdf: Possible infinite loop in PdfWriter.find_outline_item

State: Published
Severity: 6.0 Medium
Published: Oct 21, 2026
Updated: Oct 23, 2026
Reserved: Oct 20, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	6.0 Medium	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	GitHub_M

Weaknesses

CWE-835 Loop with Unreachable Exit Condition ('Infinite Loop')

Affected Products

Product	Versions
pypdfpy-pdf	< 6.20.1Affected

References

https://github.com/py-pdf/pypdf/security/advisories/GHSA-qfv9-64jg-mh7p
https://github.com/py-pdf/pypdf/pull/4188
https://github.com/py-pdf/pypdf/commit/c9c35b4471c2eb5fe078094f6c816e69d4ed25a0
https://github.com/py-pdf/pypdf/releases/tag/6.20.1

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