Description
pypdf is a free and open-source pure-python PDF library. Prior to 6.20.1, calling PdfWriter.find_outline_item on a crafted PDF with a cyclic outline hierarchy can enter an infinite loop and block the current process. This issue is fixed in version 6.20.1.
Published: 2026-10-21
Score: 6 Medium
EPSS: n/a
KEV: No
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
Github GHSA Github GHSA GHSA-qfv9-64jg-mh7p pypdf: Possible infinite loop in PdfWriter.find_outline_item
History

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 6.20.1, calling PdfWriter.find_outline_item on a crafted PDF with a cyclic outline hierarchy can enter an infinite loop and block the current process. This issue is fixed in version 6.20.1.
Title pypdf: Possible infinite loop in PdfWriter.find_outline_item
Weaknesses CWE-835
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'}

Subscriptions

No data.

cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-10-21T15:55:55.976Z

Reserved: 2026-10-20T17:39:41.373Z

Link: CVE-2026-113792

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-21T16:17:27.173

Modified: 2026-10-21T16:17:27.173

Link: CVE-2026-113792

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-21T20:15:06Z

Weaknesses
  • CWE-835

    Loop with Unreachable Exit Condition ('Infinite Loop')