What’s Vulnerable › Vulnerabilities
CVE-2026-1301: Out-of-bounds Write in o6 Automation GmbH Open62541
- Severity: medium (CVSS 6.8 v4.0)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-02-05 · updated 2026-06-17
- Weakness: CWE-787
Description
In builds with PubSub and JSON enabled, a crafted JSON message can cause the decoder to write beyond a heap-allocated array before authentication, reliably crashing the process and corrupting memory.
Affected products
- o6 Automation GmbH Open62541: from 1.5-rc1 before 1.5-rc2 — fixed in 1.5-rc2
How to fix
Upgrade to a fixed version: o6 Automation GmbH Open62541 1.5-rc2. Check the vendor advisory for mitigations.
References
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