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CVE-2026-119205 Details

Description

pypdf is a free and open-source pure-python PDF library. Prior to 6.21.4, pypdf can enter an infinite loop when cloning or duplicating a crafted cyclic DictionaryObject. Clone traversal checked generated destination references rather than the original source references, allowing some source cycles to evade the visited-object check. This issue is fixed in version 6.21.4.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:5.5 MEDIUMVector:CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/py-pdf/pypdf/commit/f176db1a1f7f9af3e472e69a843ef1175653b044	[email protected]	Patch
https://github.com/py-pdf/pypdf/pull/4288	[email protected]	Patch
https://github.com/py-pdf/pypdf/releases/tag/6.21.4	[email protected]	Release Notes
https://github.com/py-pdf/pypdf/security/advisories/GHSA-mfr5-77xh-9j7h	[email protected]	PatchVendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-835	Loop with Unreachable Exit Condition ('Infinite Loop')	[email protected]

Affected Products

Product	Versions
py-pdf pypdf	< 6.21.4
CPE cpe:2.3:a:py-pdf:pypdf:::::::: Remediation No remediation found in references.

Change History

4 change records found show changes

Date	Action	Recorded By
Nov 2, 2026	CPE Deprecation Remap	[email protected]
Nov 2, 2026	Initial Analysis	[email protected]
Oct 30, 2026	CVE Modified	CISA-ADP
Oct 29, 2026	New CVE Received	[email protected]