pycares is a Python module which provides an interface to c-ares. c-ares is a C library that performs DNS requests and name resolutions asynchronously. Prior to version 4.9.0, pycares is vulnerable to a use-after-free condition that occurs when a Channel object is garbage collected while DNS queries are still pending. This results in a fatal Python error and interpreter crash. The vulnerability has been fixed in pycares 4.9.0 by implementing a safe channel destruction mechanism.

The version of Tencent Linux installed on the remote TencentOS Server 4 host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the TSSA-2025:0971 advisory.

    Package updates are available for TencentOS Server 4 that fix the following vulnerabilities:

    CVE-2025-48945:
    pycares is a Python module which provides an interface to c-ares. c-ares is a C library that performs DNS     requests and name resolutions asynchronously. Prior to version 4.9.0, pycares is vulnerable to a use-     after-free condition that occurs when a Channel object is garbage collected while DNS queries are still     pending. This results in a fatal Python error and interpreter crash. The vulnerability has been fixed in     pycares 4.9.0 by implementing a safe channel destruction mechanism.

Tenable has extracted the preceding description block directly from the Tencent 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 SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 / openSUSE 15 host has a package installed that is affected by a vulnerability as referenced in the SUSE-SU-2025:03354-1 advisory.

    Update to version 4.10.0 (jsc#PED-13442):

    - CVE-2025-48945: Fixed use-after-free vulnerability may have led to a crash (bsc#1244691).

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.

  - pycares is a Python module which provides an interface to c-ares. c-ares is a C library that performs DNS     requests and name resolutions asynchronously. Prior to version 4.9.0, pycares is vulnerable to a use-     after-free condition that occurs when a Channel object is garbage collected while DNS queries are still     pending. This results in a fatal Python error and interpreter crash. The vulnerability has been fixed in     pycares 4.9.0 by implementing a safe channel destruction mechanism. (CVE-2025-48945)

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

The remote Fedora 42 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2025-31830e02b0 advisory.

    4.9.0


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.

The remote Fedora 41 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2025-c10725fc18 advisory.

    4.9.0

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	Type	Severity
279992	TencentOS Server 4: python-pycares (TSSA-2025:0971)	Nessus	Tencent Local Security Checks	Local	high
266018	SUSE SLED15 / SLES15 / openSUSE 15 Security Update : python-pycares (SUSE-SU-2025:03354-1)	Nessus	SuSE Local Security Checks	Local	high
252440	Linux Distros Unpatched Vulnerability : CVE-2025-48945	Nessus	Misc.	Local	high
241088	Fedora 42 : python-pycares (2025-31830e02b0)	Nessus	Fedora Local Security Checks	Local	high
240226	Fedora 41 : python-pycares (2025-c10725fc18)	Nessus	Fedora Local Security Checks	Local	high

Detections

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CVE-2025-48945

high

Tenable Plugins

high

high

high

high

high