Loop with Unreachable Exit Condition ('Infinite Loop') Affecting pypdf2 package, versions *


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.19% (8th percentile)

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  • Snyk IDSNYK-ECHOLATEST-PYPDF2-19512345
  • published3 Sept 2026
  • disclosed1 Sept 2026

Introduced: 1 Sep 2026

CVE-2026-84309  (opens in a new tab)
CWE-835  (opens in a new tab)

How to fix?

There is no fixed version for Echo:latest pypdf2.

NVD Description

Note: Versions mentioned in the description apply only to the upstream pypdf2 package and not the pypdf2 package as distributed by Echo. See How to fix? for Echo:latest relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1