pypdf is a free and open-source pure-python PDF library. Prior to 6.20.1, removing an object from a crafted cyclic PDF tree, such as an outline item, can enter an infinite loop and block the current process. This issue is fixed in version 6.20.1.

The remote openSUSE 16 host has a package installed that is affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:22188-1 advisory.

    Changes in python-pypdf:

    - CVE-2026-113786: PDF containing image data labeled with the       `/DCTDecode` filter causes Pillow to select and invoke an       unintended image parser when the image is loaded (bsc#1286632)
    - CVE-2026-113789: crafted PDF causes large memory usage or long       runtimes when an application retrieves the document's form fields       (bsc#1286633)
    - CVE-2026-113790: PDF containing arrays or dictionaries with many       elements causes parsing to consume large amounts of memory       (bsc#1286634)
    - CVE-2026-113791: PDF containing a content stream with many small       operations causes parsing to consume large amounts of memory       (bsc#1286635)
    - CVE-2026-113792: calling `PdfWriter.find_outline_item` on a       crafted PDF with a cyclic outline hierarchy can enter an infinite       loop and block the current process (bsc#1286636)
    - CVE-2026-113793: removing an object from a crafted cyclic PDF       tree can enter an infinite loop and block the current process       (bsc#1286637)
    - CVE-2026-113794: incomplete PDF that ends inside a standard       cross-reference table causes pypdf to mishandle the unexpected       end of file and enter an infinite loop (bsc#1286638)
    - CVE-2026-113795: accessing a crafted PDF stream with a large       number of filters or multiple filters that pass around large       amounts of data can cause large memory consumption (bsc#1286639)

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

Note that Nessus has not tested for these issues 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. Prior to 6.20.1, removing an object from a     crafted cyclic PDF tree, such as an outline item, can enter an infinite loop and block the current     process. This issue is fixed in version 6.20.1. (CVE-2026-113793)

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

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 6.20.1, removing an object from a
    crafted cyclic PDF tree, such as an outline item, can enter an infinite loop and block the current
    process. This issue is fixed in version 6.20.1. (CVE-2026-113793)

ID	Name	Product	Family	Type	Severity
374765	openSUSE 16 Security Update : python-pypdf (openSUSE-SU-2026:22188-1)	Nessus	SuSE Local Security Checks	Local	medium
370990	Linux Distros Unpatched Vulnerability : CVE-2026-113793	Nessus	Misc.	Local	medium
476560	SCA: security update for pypdf (GHSA-9mx8-4j7g-633p)	Tenable Cloud Security	SCA Checks	Local	medium
476560	SCA: security update for pypdf (GHSA-9mx8-4j7g-633p)	Tenable Self-Hosted Container Security	SCA Checks	Local	medium

Detections

Analytics

CVE-2026-113793

medium

Tenable Plugins

medium

medium

medium

medium