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CVE-2026-119203 Details

Description

pypdf is a free and open-source pure-python PDF library. Prior to 6.21.4, pypdf can enter an infinite loop while opening a crafted incomplete PDF whose standard cross-reference table reaches the end of the file without a trailer. The trailer search can repeatedly rewind to the same stream position instead of terminating when parsing makes no progress, blocking the processing thread. 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/06593f993789a4b573dd955730c1a7051128bb2a	[email protected]	Patch
https://github.com/py-pdf/pypdf/pull/4289	[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-5849-834g-hvw5	[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]