A use-after-free vulnerability exists in the coap_delete_pdu_lkd function within coap_pdu.c of the libcoap library. This issue occurs due to improper handling of memory after the freeing of a PDU object, leading to potential memory corruption or the possibility of executing arbitrary code. NOTE: this is disputed by the Supplier because it only occurs when an application uses libcoap incorrectly.

fedora FEDORA-2025-6a43695048: libcoap-4.3.5a-1.fc42

The remote Fedora 42 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2025-6a43695048 advisory.

    Update to security release 4.3.5a


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 remote Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2025-d408d76c4a advisory.

    Update to security release 4.3.5a


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 use-after-free vulnerability exists in the coap_delete_pdu_lkd function within coap_pdu.c of the libcoap     library. This issue occurs due to improper handling of memory after the freeing of a PDU object, leading     to potential memory corruption or the possibility of executing arbitrary code. NOTE: this is disputed by     the Supplier because it only occurs when an application uses libcoap incorrectly. (CVE-2025-50518)

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

ID	Name	Product	Family	Severity
277587	Fedora 42 : libcoap (2025-6a43695048)	Nessus	Fedora Local Security Checks	critical
277552	Fedora 43 : libcoap (2025-d408d76c4a)	Nessus	Fedora Local Security Checks	critical
259996	Linux Distros Unpatched Vulnerability : CVE-2025-50518	Nessus	Misc.	critical

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