Is CVE-2026-113786 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-113786 being exploited in the wild.

How severe is CVE-2026-113786?

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

Which products and versions are affected?

Pypdf before 6.21.1; pypdf (PyPI) < 6.21.1, ECOSYSTEM:introduced=0,fixed=6.21.1.

Is there a fix for CVE-2026-113786?

Yes. pypdf (PyPI): upgrade to 6.21.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-113786 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-113786?

Check whether you run 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-2026-113786: pypdf unsafe image plugin selection in DCTDecode handler

Q: Is there a fix for CVE-2026-113786?

Yes. pypdf (PyPI): upgrade to 6.21.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

Q: How is CVE-2026-113786 attacked?

It is attacked over the network, in a software library.

Q: Am I affected by CVE-2026-113786?

Check whether you run 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-2026-113786 · Severity: medium · CVSS 4 · Published 2026-10-21

pypdf is a Python library for reading and manipulating PDF files. When processing a specially crafted PDF containing image data, the library can be tricked into invoking unintended image parsers—specifically those that run external commands like Ghostscript—leading to arbitrary code execution if Ghostscript is installed on the system.

Technologies: Pypdf, pypdf (PyPI). Vendors: Pypdf, PyPI.

Quick answers

Is CVE-2026-113786 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-113786 being exploited in the wild.
How severe is CVE-2026-113786?: Medium severity, with a CVSS score of 4, published 21 October 2026.
Which products and versions are affected?: Pypdf before 6.21.1; pypdf (PyPI) < 6.21.1, ECOSYSTEM:introduced=0,fixed=6.21.1.
Is there a fix for CVE-2026-113786?: Yes. pypdf (PyPI): upgrade to 6.21.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-113786 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-113786?: Check whether you run 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 6.21.1 or later
```
pip install "pypdf>=6.21.1"
```

Technical details

The vulnerability exists in the _xobj_to_image function, which processes DCTDecode-filtered image streams. Without restricting the image format, Pillow's Image.open() sniffs the stream bytes and selects a parser based on file magic bytes rather than the declared format, allowing an attacker to embed non-JPEG data (such as EPS) that triggers external command execution via the EpsImagePlugin. The fix restricts DCTDecode processing to JPEG format only, preventing plugin confusion.

Affected products

pypdf pypdf before 6.21.1

Identifiers

CVE-2026-113786
GHSA-5hx5-vpf9-5wcv

Timeline

2026-10-21: disclosed
2026-10-17: patched

References

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