pypdf is a free and open-source pure-python PDF library. Versions prior to 6.9.1 allow an attacker to craft a malicious PDF which leads to long runtimes and/or large memory usage. Exploitation requires accessing an array-based stream with many entries. This issue has been fixed in version 6.9.1.

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. Versions prior to 6.9.1 allow an attacker to
    craft a malicious PDF which leads to long runtimes and/or large memory usage. Exploitation requires
    accessing an array-based stream with many entries. This issue has been fixed in version 6.9.1.
    (CVE-2026-33123)

The remote openSUSE 16 host has a package installed that is affected by a vulnerability as referenced in the openSUSE- SU-2026:20430-1 advisory.

    Changes in python-PyPDF2:

    - CVE-2026-33123: Fixed excessive resource consumption when processing specially       crafted PDF due to inefficient decoding of array-based streams (bsc#1259992)

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

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. Versions prior to 6.9.1 allow an attacker to     craft a malicious PDF which leads to long runtimes and/or large memory usage. Exploitation requires     accessing an array-based stream with many entries. This issue has been fixed in version 6.9.1.
    (CVE-2026-33123)

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

ID	Name	Product	Family	Type	Severity
461108	Echo: pypdf: security update to 6.9.1	Tenable Cloud Security	Echo Local Security Checks	Local	medium
461108	Echo: pypdf: security update to 6.9.1	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	medium
304223	openSUSE 16 Security Update : python-PyPDF2 (openSUSE-SU-2026:20430-1)	Nessus	SuSE Local Security Checks	Local	medium
303237	Linux Distros Unpatched Vulnerability : CVE-2026-33123	Nessus	Misc.	Local	medium
438942	SCA: security update for pypdf (GHSA-qpxp-75px-xjcp)	Tenable Cloud Security	SCA Checks	Local	medium
438942	SCA: security update for pypdf (GHSA-qpxp-75px-xjcp)	Tenable Self-Hosted Container Security	SCA Checks	Local	medium

Detections

Analytics

CVE-2026-33123

medium

Tenable Plugins

medium

medium

medium

medium

medium

medium