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
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.007 (52.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 52.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.007 · change: +0.003
Affected products
- Open62541 — versions 1.5.0, 1.5.1, 1.5.2
Weakness classification (CWE)
References
- vuldb.com/vuln/397123 (technical-description, vdb-entry)
- vuldb.com/vuln/397123/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-82623 (third-party-advisory)
- vuldb.com/submit/893207 (third-party-advisory)
- github.com/open62541/open62541/issues/8199 (issue-tracking, exploit)
- github.com/open62541/open62541/ (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.