A vulnerability exists in the inftrees.c component of the zlib library, which is bundled within the PointCloudLibrary (PCL). This issue may allow context-dependent attackers to cause undefined behavior by exploiting improper pointer arithmetic. Since version 1.14.0, PCL by default uses a zlib installation from the system, unless the user sets WITH_SYSTEM_ZLIB=FALSE. So this potential vulnerability is only relevant if the PCL version is older than 1.14.0 or the user specifically requests to not use the system zlib.

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2025-984684 advisory.

    A vulnerability exists in the inftrees.c component of the zlib library, which is bundled within the     PointCloudLibrary (PCL). This issue may allow context-dependent attackers to cause undefined behavior by     exploiting improper pointer arithmetic.

    Since version 1.14.0, PCL by default uses a zlib installation from the system, unless the user sets     WITH_SYSTEM_ZLIB=FALSE. So this potential vulnerability is only relevant if the PCL version is older than     1.14.0 or the user specifically requests to not use the system zlib.

Tenable has extracted the preceding description block directly from the Unity Linux 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 remote Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2025-bcf8a956fa advisory.

    Automatic update for zsync-0.6.2-3.fc43.

    ##### **Changelog**

    ```
    * Thu May 15 2025 Tobias Girstmair <t-fedora@girst.at> - 0.6.2-3
    - fix zlib source path in patch file
    * Thu May 15 2025 Tobias Girstmair <t-fedora@girst.at> - 0.6.2-2
    - include a patch for CVE-2016-9840 (RHBZ#2366435)

    ```

Tenable has extracted the preceding description block directly from the Fedora 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.

  - A vulnerability exists in the inftrees.c component of the zlib library, which is bundled within the     PointCloudLibrary (PCL). This issue may allow context-dependent attackers to cause undefined behavior by     exploiting improper pointer arithmetic. Since version 1.14.0, PCL by default uses a zlib installation from     the system, unless the user sets WITH_SYSTEM_ZLIB=FALSE. So this potential vulnerability is only relevant     if the PCL version is older than 1.14.0 or the user specifically requests to not use the system zlib.
    (CVE-2025-4638)

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

The remote Fedora 41 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2025-8365ba2261 advisory.

    fix zlib source path in patch file

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

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

ID	Name	Product	Family	Severity
267654	Unity Linux 20.1070a Security Update: rsync (UTSA-2025-984684)	Nessus	Unity Linux Local Security Checks	critical
249157	Fedora 43 : zsync (2025-bcf8a956fa)	Nessus	Fedora Local Security Checks	critical
248393	Linux Distros Unpatched Vulnerability : CVE-2025-4638	Nessus	Misc.	high
237175	Fedora 41 : zsync (2025-8365ba2261)	Nessus	Fedora Local Security Checks	critical

Detections

Analytics

CVE-2025-4638

critical

Tenable Plugins

critical

critical

high

critical