CVE-2026-63362 o6 Automation open62541 Integer Underflow
A remote attacker can cause a denial of service in open62541 via a crafted UDP packet due to an integer underflow in PubSub signature verification.
- 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-2026-63362?
CVE-2026-63362 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 unsigned integer underflow in the PubSub signature verification path in open62541 may allow a remote attacker to cause a denial of service via a crafted UDP packet.
Weakness: CWE-191
Which versions are affected by CVE-2026-63362?
How do I fix CVE-2026-63362?
No fix has been published for CVE-2026-63362 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-63362 being exploited?
There is no known exploitation of CVE-2026-63362 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-63362, GHSA-qv76-j3j3-2f94, UBUNTU-CVE-2026-63362.