Denial of Service Vulnerability in pypdf Open-Source PDF Library
CVE-2026-113793

6MEDIUM

Key Information:

Vendor

Py-PDF

Status
PyPDF
Vendor
CVE Published:
21 October 2026

What is CVE-2026-113793?

The pypdf library, a popular open-source PDF processing tool, contains a vulnerability prior to version 6.20.1 that can lead to a denial of service. Specifically, manipulating a cyclic PDF structure by removing an object like an outline item can cause the library to enter an infinite loop, effectively blocking the current process. This vulnerability could impact applications relying on pypdf for PDF manipulations, making it essential to update to the patched version 6.20.1 to ensure stable operation and prevent disruption.

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

.