Description
pypdf is a free and open-source pure-python PDF library. Prior to 6.20.1, removing an object from a crafted cyclic PDF tree, such as an outline item, 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
Impact: n/a
Action: n/a
AI Analysis

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Remediation

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Tracking

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-9mx8-4j7g-633p pypdf: Possible infinite loop when removing tree items
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, removing an object from a crafted cyclic PDF tree, such as an outline item, can enter an infinite loop and block the current process. This issue is fixed in version 6.20.1.
Title pypdf: Possible infinite loop when removing tree items
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

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-10-21T15:57:55.600Z

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

Link: CVE-2026-113793

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-21T16:17:27.327

Modified: 2026-10-21T16:17:27.327

Link: CVE-2026-113793

cve-icon Redhat

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cve-icon OpenCVE Enrichment

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Weaknesses
  • CWE-835

    Loop with Unreachable Exit Condition ('Infinite Loop')