CVE-2026-82623 open62541 History Backend ua_history_data_backend_memory.c UA_DataValue_backend_copyRange use after free
A remote attacker can trigger a use-after-free in the open62541 History Backend, potentially leading to code execution or denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-82623?
CVE-2026-82623 is a medium-severity use after free vulnerability in open62541, published on 31 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Which versions are affected by CVE-2026-82623?
How do I fix CVE-2026-82623?
No fix has been published for CVE-2026-82623 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-82623 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-82623 exists.
Sources
Also known as DEBIAN-CVE-2026-82623, GHSA-w6p5-54jx-cmmh, UBUNTU-CVE-2026-82623.