Description
pypdf is a free and open-source pure-python PDF library. Prior to 6.16.0, an attacker can craft a PDF whose cyclic tree structure causes pypdf/generic/_data_structures.py TreeObject.insert_child to follow /Next links indefinitely when a writing code path inserts a child, producing an infinite loop. This issue is fixed in version 6.16.0.
Published: 2026-09-01
Score: 6.9 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-jp53-mhqp-8xcg pypdf: Possible infinite loop for TreeObject.insert_child
History

Tue, 01 Sep 2026 22:00:00 +0000

Type Values Removed Values Added
Description pypdf is a free and open-source pure-python PDF library. Prior to 6.16.0, an attacker can craft a PDF whose cyclic tree structure causes pypdf/generic/_data_structures.py TreeObject.insert_child to follow /Next links indefinitely when a writing code path inserts a child, producing an infinite loop. This issue is fixed in version 6.16.0.
Title pypdf: Possible infinite loop for TreeObject.insert_child
Weaknesses CWE-835
References
Metrics cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/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: 2026-09-01T19:58:46.266Z

Reserved: 2026-09-01T16:17:43.079Z

Link: CVE-2026-84309

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-01T20:17:25.027

Modified: 2026-09-01T20:17:25.027

Link: CVE-2026-84309

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

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Weaknesses
  • CWE-835

    Loop with Unreachable Exit Condition ('Infinite Loop')