pypdf is a free and open-source pure-python PDF library. Prior to 6.21.0, an attacker can craft a PDF that causes large memory usage or long runtimes when an application retrieves the document's form fields. This issue is fixed in version 6.21.0.
History

Wed, 28 Oct 2026 17:30:00 +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-770
References
Metrics threat_severity

None

cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'}

threat_severity

Moderate


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 6.21.0, an attacker can craft a PDF that causes large memory usage or long runtimes when an application retrieves the document's form fields. This issue is fixed in version 6.21.0.
Title pypdf: Possible long runtimes/large memory usage when retrieving form fields
Weaknesses CWE-400
CWE-407
References
Metrics cvssV4_0

{'score': 6, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-10-21T15:33:45.801Z

Updated: 2026-10-28T16:42:29.030Z

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

Link: CVE-2026-113789

cve-icon Vulnrichment

Updated: 2026-10-28T16:42:25.960Z

cve-icon NVD

Status : Undergoing Analysis

Published: 2026-10-21T16:17:26.603

Modified: 2026-10-28T17:17:44.787

Link: CVE-2026-113789

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-10-21T15:33:45Z

Links: CVE-2026-113789 - Bugzilla