CVE-2026-1301
Medium
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.
SeverityMedium
CVSS6.8
Exploit probability—
ProductOpen62541
PublishedFeb 5, 2026
First seenFeb 5, 2026
Weakness typeCWE-787Out-of-bounds write
How to fix
Update
- o6 Automation GmbH Open625411.5-rc2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| o6 Automation GmbH Open62541 | 1.5-rc1 ≤ v < 1.5-rc2 | 1.5-rc2 |
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