CVE-2026-67863 Use after free in n/a
A remote attacker can cause a denial of service in open62541 by triggering a use-after-free in the local MonitoredItem callback path.
- 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-2026-67863?
CVE-2026-67863 is a high-severity use after free vulnerability in n/a, published on 5 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In open62541 1.5.5, a server-side use-after-free exists in the local MonitoredItem callback path. The issue occurs when UA_Subscription_localPublish continues to use the current UA_Notification after a callback invokes UA_Server_deleteMonitoredItem for the current local MonitoredItem. This allows a remote attacker to cause a denial of service.
Weakness: CWE-416
Which versions are affected by CVE-2026-67863?
How do I fix CVE-2026-67863?
No fix has been published for CVE-2026-67863 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-2026-67863 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-67863 exists.
Sources
Also known as DEBIAN-CVE-2026-67863, GHSA-j8g3-2qjc-25x2, UBUNTU-CVE-2026-67863.