Is CVE-2026-113792 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-113792 being exploited in the wild.

How severe is CVE-2026-113792?

Medium severity, with a CVSS score of 4, published 21 October 2026.

Which products and versions are affected?

Py-Pdf Pypdf before 6.20.1; pypdf (PyPI) < 6.20.1, ECOSYSTEM:introduced=0,fixed=6.20.1.

Is there a fix for CVE-2026-113792?

Yes. pypdf (PyPI): upgrade to 6.20.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-113792 attacked?

It is attacked over the network or with local access, in a software library.

Am I affected by CVE-2026-113792?

Check whether you run Py-Pdf Pypdf or pypdf (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-113792: pypdf infinite loop in find_outline_item with cyclic PDF outline

Q: Is there a fix for CVE-2026-113792?

Yes. pypdf (PyPI): upgrade to 6.20.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

Q: How is CVE-2026-113792 attacked?

It is attacked over the network or with local access, in a software library.

Q: Am I affected by CVE-2026-113792?

Check whether you run Py-Pdf Pypdf or pypdf (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-113792 · Severity: medium · CVSS 4 · Published 2026-10-21

pypdf is a Python library for reading and writing PDF files. When processing a maliciously crafted PDF with a cyclic outline structure, the find_outline_item function enters an infinite loop, causing the application to hang or become unresponsive.

Technologies: Py-Pdf Pypdf, pypdf (PyPI). Vendors: Py-Pdf, PyPI.

Quick answers

Is CVE-2026-113792 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-113792 being exploited in the wild.
How severe is CVE-2026-113792?: Medium severity, with a CVSS score of 4, published 21 October 2026.
Which products and versions are affected?: Py-Pdf Pypdf before 6.20.1; pypdf (PyPI) < 6.20.1, ECOSYSTEM:introduced=0,fixed=6.20.1.
Is there a fix for CVE-2026-113792?: Yes. pypdf (PyPI): upgrade to 6.20.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-113792 attacked?: It is attacked over the network or with local access, in a software library.
Am I affected by CVE-2026-113792?: Check whether you run Py-Pdf Pypdf or pypdf (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

pypdf (PyPI): upgrade to 6.20.1 or later
```
pip install "pypdf>=6.20.1"
```

Technical details

The vulnerability exists in the find_outline_item method of PdfWriter, which fails to detect cycles in the PDF outline tree hierarchy. When a crafted PDF contains circular references in its outline structure, the recursive tree traversal loops indefinitely. The fix adds cycle detection by tracking visited nodes during traversal.

Affected products

py-pdf pypdf before 6.20.1

Identifiers

CVE-2026-113792
GHSA-qfv9-64jg-mh7p

Timeline

2026-10-21: disclosed
2026-10-12: patched

References

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