An unauthenticated remote attacker can exhaust server memory via the FindServers Discovery Service in open62541. The serverUris field of FindServersRequest is not validated for length or array size. An attacker can declare an arbitrarily large string (up to ~3.9 GB) delivered across intermediate chunks without ever sending the final chunk. The server buffers all chunks in RAM indefinitely until the SecureChannel times out. The attack is pre-session and bypasses all encryption configuration. The issue affects open62541: from 1.4.0 through 1.4.16, from 1.5.0 through 1.5.4, master.

The remote Fedora 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-23b21104ef advisory.

    Update to 1.5.6

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-2026-1435f05fde advisory.

    Update to 1.5.6

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.

  - An unauthenticated remote attacker can exhaust server memory via the FindServers Discovery Service in     open62541. The serverUris field of FindServersRequest is not validated for length or array size. An     attacker can declare an arbitrarily large string (up to ~3.9 GB) delivered across intermediate chunks     without ever sending the final chunk. The server buffers all chunks in RAM indefinitely until the     SecureChannel times out. The attack is pre-session and bypasses all encryption configuration. The issue     affects open62541: from 1.4.0 through 1.4.16, from 1.5.0 through 1.5.4, master. (CVE-2026-33592)

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

ID	Name	Product	Family	Type	Severity
332081	Fedora 44 : open62541 (2026-23b21104ef)	Nessus	Fedora Local Security Checks	Local	low
332079	Fedora 43 : open62541 (2026-1435f05fde)	Nessus	Fedora Local Security Checks	Local	low
325071	Linux Distros Unpatched Vulnerability : CVE-2026-33592	Nessus	Misc.	Local	high

Detections

Analytics

CVE-2026-33592

high

Tenable Plugins

low

low

high