Buffer overflow in Open62541
CVE-2026-82623
A vulnerability was detected in open62541 up to 1.5.5. Affected by this vulnerability is the function UA_DataValue_backend_copyRange of the file plugins/historydata/ua_history_data_backend_memory.c of the component History Backend. The manipulation results in use after free. The attack can be launched remotely. The exploit is now public and may be used. The project closed the issue report, stating that this is not the official way to report a security vulnerability.
Vulnerability class: Buffer Overflow
EPSS: 0.004 (33.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/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 (technical-description, vdb-entry)
- cna@vuldb.com (signature, permissions-required)
- cna@vuldb.com (third-party-advisory)
- cna@vuldb.com (third-party-advisory)
- cna@vuldb.com (issue-tracking, exploit)
- cna@vuldb.com (product)
Frequently asked questions
- What is CVE-2026-82623?
- CVE-2026-82623 is a medium-severity vulnerability in Open62541, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 5.3/10. Published 2026-08-31.
- How severe is CVE-2026-82623?
- Medium severity. CVSS v3 base score is 5.3 out of 10.