Infinite Loop Vulnerability in PyPDF Library by PyPDF
CVE-2026-113792

6MEDIUM

Key Information:

Vendor

Py-PDF

Status
PyPDF
Vendor
CVE Published:
21 October 2026

What is CVE-2026-113792?

The PyPDF library, a free and open-source PDF manipulation tool, contains a vulnerability that can lead to an infinite loop when the PdfWriter.find_outline_item function is called on a specially crafted PDF containing a cyclic outline hierarchy. This flaw can cause the current process to block indefinitely, impacting applications that rely on PyPDF for PDF processing. The issue has been addressed in version 6.20.1, where users are encouraged to upgrade to mitigate this risk.

Affected Version(s)

pypdf < 6.20.1

References

https://github.com/py-pdf/pypdf/security/advisories/GHSA-...
x_refsource_CONFIRM
https://github.com/py-pdf/pypdf/pull/4188
x_refsource_MISC
https://github.com/py-pdf/pypdf/commit/c9c35b4471c2eb5fe0...
x_refsource_MISC

CVSS V4

Score:
6
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.