CVE-2026-63559 o6 Automation open62541 Integer Overflow or Wraparound
A remote attacker can exploit an integer overflow in open62541 to read out-of-bounds heap memory and disclose sensitive information.
- 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-2026-63559?
CVE-2026-63559 is a high-severity vulnerability in o6 Automation open62541, published on 30 Jul 2026. An attacker can exploit it over the internet without logging in, 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 read out-of-bounds heap memory, potentially disclosing sensitive information.
Weakness: CWE-190
Which versions are affected by CVE-2026-63559?
How do I fix CVE-2026-63559?
No fix has been published for CVE-2026-63559 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-63559 being exploited?
There is no known exploitation of CVE-2026-63559 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-63559, GHSA-6c97-xqf2-q99q, UBUNTU-CVE-2026-63559.