VULNERABILITY INTELLIGENCE

CVE-2026-84309

CVSS score5.5 MEDIUM
EPSS probability0.19%
CISA KEVNot currently listed
Published2026-09-01
Last modified2026-10-05
CVSS vectorCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

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.

Weakness classification

  • security-advisories@github.com: CWE-835

Primary references