CVE-2026-67870

In open62541 v1.5.5, the server-side AddReferences implementation contains an incomplete...

9.8 Critical

In open62541 v1.5.5, the server-side AddReferences implementation contains an incomplete validation flaw for non-local ExpandedNodeId targets. A remote attacker can send a crafted AddReferencesRequest with an empty targetServerUri and a non-zero targetNodeId.serverIndex, causing the target node pointer to remain NULL while execution continues.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

1.06%Up 0.8 points since Aug 6, 2026

What each source reports

CVE List Score used 9.8

Record: CVE-2026-67870
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-476
Updated: 2026-11-02

EUVDEUVD-2026-53681 9.8

Record: EUVD-2026-53681
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

GitHub AdvisoriesGHSA-3jmw-8hr3-2j76 9.8

In open62541 v1.5.5, the server-side AddReferences implementation contains an incomplete...

Record: GHSA-3jmw-8hr3-2j76
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-476
Updated: 2026-11-02

NVD 9.8

Record: CVE-2026-67870
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-476
Updated: 2026-11-02

OSVDEBIAN-CVE-2026-67870 9.8

Record: DEBIAN-CVE-2026-67870
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2026-67870 9.8

Record: UBUNTU-CVE-2026-67870
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

Affected packages

Affected packages
Package	Affected	Fixed
`open62541` Debian:13	All versions, plus listed versions 1.4.11.1-11.4.18-1	None known
`open62541` Debian:14	All versions, plus listed versions 1.4.11.1-11.4.18-1	None known
`open62541` Ubuntu:26.10	All versions, plus listed versions 1.4.11.1-1build11.4.18-1	None known
`open62541` Ubuntu:26.04:LTS	All versions, plus listed versions 1.4.11.1-11.4.11.1-1build1	None known

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-67870 is a critical vulnerability (CVSS 9.8) in open62541, published August 5, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.06%, the 64th percentile. No source names a fixed version.