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.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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. (CVE-2026-84309)

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2026-84309)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
462724	Echo: pypdf: security update to 6.16.0	Tenable Cloud Security	Echo Local Security Checks	Local	medium
462724	Echo: pypdf: security update to 6.16.0	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	medium
342560	Linux Distros Unpatched Vulnerability : CVE-2026-84309	Nessus	Misc.	Local	medium

Detections

Analytics

CVE-2026-84309

medium

Tenable Plugins

medium

medium

medium