CVE-2026-65423 o6 Automation open62541 Integer Overflow or Wraparound
A remote attacker can trigger an out-of-bounds write via integer overflow in open62541, potentially leading to code execution or denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-65423?
CVE-2026-65423 is a high-severity vulnerability in o6 Automation open62541, published on 30 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
An integer overflow in the UA_Variant arrayDimensions product computation in open62541 may allow a remote attacker to trigger an out-of-bounds write.
Weakness: CWE-190
Which versions are affected by CVE-2026-65423?
How do I fix CVE-2026-65423?
No fix has been published for CVE-2026-65423 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-65423 being exploited?
There is no known exploitation of CVE-2026-65423 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-65423, GHSA-hmp2-mjrw-2c5w, UBUNTU-CVE-2026-65423.