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.
History

Wed, 28 Oct 2026 07:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 22 Oct 2026 12:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-1286
References
Metrics threat_severity

None

cvssV3_1

{'score': 3.3, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L'}

threat_severity

Low


Thu, 22 Oct 2026 00:30:00 +0000

Type Values Removed Values Added
First Time appeared Py-pdf
Py-pdf pypdf
Vendors & Products Py-pdf
Py-pdf pypdf

Wed, 21 Oct 2026 17:15:00 +0000

Type Values Removed Values Added
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.
Title pypdf: Unvalidated JPEG image data loading
Weaknesses CWE-183
CWE-20
References
Metrics cvssV4_0

{'score': 2.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-10-21T14:38:39.617Z

Updated: 2026-10-27T22:18:57.010Z

Reserved: 2026-10-20T17:39:41.372Z

Link: CVE-2026-113786

cve-icon Vulnrichment

Updated: 2026-10-27T22:18:52.770Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-21T15:17:16.703

Modified: 2026-10-27T23:16:57.327

Link: CVE-2026-113786

cve-icon Redhat

Severity : Low

Publid Date: 2026-10-21T14:38:39Z

Links: CVE-2026-113786 - Bugzilla