CVE-2026-82623: open62541 History Backend ua_history_data_backend_memory.c UA_DataValue_backend_copyRange use after free
A vulnerability was detected in open62541 up to 1.5.5. Affected by this vulnerability is the function UADataValuebackendcopyRange of the file plugins/historydata/uahistorydatabackendmemory.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.
Affected Software
Event History
Frequently Asked Questions
Which deployments are affected?
open62541 versions up to 1.5.5 are identified as affected, specifically the History Backend component and its in-memory history data backend implementation.
Can this be exploited remotely without credentials or user interaction?
Yes. The supplied vector identifies network attack access, low attack complexity, no required privileges, and no user interaction.
What impact is indicated by the available severity data?
The provided CVSS data indicates low availability impact and no stated confidentiality or integrity impact. The weakness is described as a use-after-free and is also classified under buffer overflow.
Is exploit code available?
Yes. The information states that a public exploit exists and may be used.