CVE-2026-1301CWE-787

Out-of-bounds Write in o6 Automation GmbH Open62541

Medium · published February 5, 2026

CVSS v4.0
6.8
EPSS
0%
Percentile
31.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
6.8 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
EPSS
0.00387 · 31.5th percentile
Weakness
CWE-787 · Out-of-bounds Write
Published
2026-02-05T19:09Z
EPSS history
Timeline
  • 05 FEB 19:09Z
    Out-of-bounds Write in o6 Automation GmbH Open62541
    cvelistv5