Description
pypdf is a free and open-source pure-python PDF library. An attacker who uses a vulnerability present in versions 3.7.0 through 3.16.4 can craft a PDF which leads to an infinite loop. This infinite loop blocks the current process and can utilize a single core of the CPU by 100%. It does not affect memory usage. That is, for example, the case when the pypdf-user manipulates an incoming malicious PDF e.g. by merging it with another PDF or by adding annotations. The issue was fixed in version 3.17.0. As a workaround, apply the patch manually by modifying `pypdf/generic/_data_structures.py`.
Published: 2023-10-31
Score: 5.1 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
EUVD EUVD EUVD-2023-2830 pypdf is a free and open-source pure-python PDF library. An attacker who uses a vulnerability present in versions 3.7.0 through 3.16.4 can craft a PDF which leads to an infinite loop. This infinite loop blocks the current process and can utilize a single core of the CPU by 100%. It does not affect memory usage. That is, for example, the case when the pypdf-user manipulates an incoming malicious PDF e.g. by merging it with another PDF or by adding annotations. The issue was fixed in version 3.17.0. As a workaround, apply the patch manually by modifying `pypdf/generic/_data_structures.py`.
Github GHSA Github GHSA GHSA-wjcc-cq79-p63f Possible Infinite Loop when PdfWriter(clone_from) is used with a PDF
History

Mon, 02 Nov 2026 16:15:00 +0000

Type Values Removed Values Added
First Time appeared Py-pdf
Py-pdf pypdf
CPEs cpe:2.3:a:pypdf_project:pypdf:*:*:*:*:*:*:*:* cpe:2.3:a:py-pdf:pypdf:*:*:*:*:*:*:*:*
Vendors & Products Pypdf Project
Pypdf Project pypdf
Py-pdf
Py-pdf pypdf

cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2024-09-05T18:54:52.306Z

Reserved: 2023-10-19T20:34:00.948Z

Link: CVE-2023-46250

cve-icon Vulnrichment

Updated: 2024-08-02T20:37:40.140Z

cve-icon NVD

Status : Modified

Published: 2023-10-31T16:15:09.930

Modified: 2026-11-02T16:06:04.477

Link: CVE-2023-46250

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses
  • CWE-835

    Loop with Unreachable Exit Condition ('Infinite Loop')