CVE-2026-113786 pypdf: Unvalidated JPEG image data loading
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-113786?
CVE-2026-113786 is a low-severity vulnerability in py-pdf pypdf, published on 21 Oct 2026.
Official description
pypdf is a free and open-source pure-python PDF library. Prior to 6.21.1, an attacker can craft a PDF containing image data labeled with the /DCTDecode filter that causes Pillow to select and invoke an unintended image parser when the image is loaded. Environments without the optional Pillow dependency are not affected. This issue is fixed in version 6.21.1.
Which versions are affected by CVE-2026-113786?
2 open source packages ship an affected version, including pypdf.
| Package | Affected | Fixed in |
|---|---|---|
pypdf PyPI | All versions | 6.21.1 |
pypdf PyPI | All versions | 6.21.1 |
How do I fix CVE-2026-113786?
Upgrade pypdf to 6.21.1 or later.
Is CVE-2026-113786 being exploited?
There is no known exploitation of CVE-2026-113786 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-113786, ECHO-a02d-80f2-f8bd, GHSA-5hx5-vpf9-5wcv, UBUNTU-CVE-2026-113786.