CVE-2026-113786

CVSS 2.3 (low) · published 2026-10-21

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.

Weakness: CWE-20, CWE-183

Source: NVD CVE-2026-113786

References

• https://github.com/py-pdf/pypdf/commit/512d8eb94eb04be1d1c90504e6da2dcef8679e07
• https://github.com/py-pdf/pypdf/pull/4222
• https://github.com/py-pdf/pypdf/releases/tag/6.21.1
• https://github.com/py-pdf/pypdf/security/advisories/GHSA-5hx5-vpf9-5wcv

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