NULL pointer dereference in Open62541
CVE-2026-15690
A vulnerability was identified in open62541 up to 1.5.5. Affected by this issue is the function responseReadNamespacesArray of the file src/client/ua_client_connect.c of the component Shared Client Library. Such manipulation of the argument Server_NamespaceArray leads to null pointer dereference. The attack can be executed remotely. The attack requires a high level of complexity. The exploitation is known to be difficult. The exploit is publicly available and might be used. The project closed the issue report, stating that this is not the official way to report a security vulnerability.
EPSS: 0.004 (36.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 3.1 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L.
Affected products
- N/a Open62541 — versions 1.5.0, 1.5.1, 1.5.2
Weakness classification (CWE)
References
- cna@vuldb.com (product)
- cna@vuldb.com (issue-tracking, exploit)
- cna@vuldb.com (third-party-advisory)
- cna@vuldb.com (third-party-advisory)
- cna@vuldb.com (technical-description, vdb-entry)
- cna@vuldb.com (signature, permissions-required)
Frequently asked questions
- What is CVE-2026-15690?
- CVE-2026-15690 is a low-severity vulnerability in Open62541, classified under Improper Resource Shutdown or Release. CVSS score: 3.1/10. Published 2026-07-14.
- How severe is CVE-2026-15690?
- Low severity. CVSS v3 base score is 3.1 out of 10.