pypdf is a free and open-source pure-python PDF library. Prior to 6.7.1, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires a malformed /FlateDecode stream, where the byte-by-byte decompression is used. This vulnerability is fixed in 6.7.1.

The remote openSUSE 16 host has a package installed that is affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:20333-1 advisory.

    Changes in python-PyPDF2:

    - CVE-2026-27628: Fixed infinite loop when loading circular /Prev entries in cross-reference streams     (bsc#1258940)
    - CVE-2026-27888: Fixed issue where manipulated FlateDecode XFA streams can exhaust RAM (bsc#1258934)
    - CVE-2025-55197: Fixed denial of service via craft PDF (bsc#1248089)
    - CVE-2026-27024: Fixed infinite loop when processing TreeObject (bsc#1258691)
    - CVE-2026-27025: Fixed long runtimes/large memory usage for large /ToUnicode streams (bsc#1258692)
    - CVE-2026-27026: Fixed long runtimes for malformed FlateDecode streams (bsc#1258693)

    - Convert to pip-based build

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 6.7.1, an attacker who uses this     vulnerability can craft a PDF which leads to long runtimes. This requires a malformed /FlateDecode stream,     where the byte-by-byte decompression is used. This vulnerability is fixed in 6.7.1. (CVE-2026-27026)

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 6.7.1, an attacker who uses this
    vulnerability can craft a PDF which leads to long runtimes. This requires a malformed /FlateDecode stream,
    where the byte-by-byte decompression is used. This vulnerability is fixed in 6.7.1. (CVE-2026-27026)

ID	Name	Product	Family	Type	Severity
301471	openSUSE 16 Security Update : python-PyPDF2 (openSUSE-SU-2026:20333-1)	Nessus	SuSE Local Security Checks	Local	high
299729	Linux Distros Unpatched Vulnerability : CVE-2026-27026	Nessus	Misc.	Local	medium
437836	SCA: security update for pypdf (GHSA-9mvc-8737-8j8h)	Tenable Cloud Security	SCA Checks	Local	medium
437836	SCA: security update for pypdf (GHSA-9mvc-8737-8j8h)	Tenable Self-Hosted Container Security	SCA Checks	Local	medium

Detections

Analytics

CVE-2026-27026

medium

Tenable Plugins

high

medium

medium

medium