Out-of-bounds Write in o6 Automation GmbH Open62541
Priority LOW 30CWE-787Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- Active
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00381 32nd percentileScored 2026-11-07
Fix Fixed Open62541 (o6 Automation GmbH): 1.5-rc2
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| o6 Automation | Open62541 | 1.5-rc1 to before 1.5-rc2 | 1.5-rc2 | Patch available | CNA |
- Open62541 Vendoro6 Automation Affected 1.5-rc1 to before 1.5-rc2 Fixed in 1.5-rc2 Patch available CNA
Remediation
- Fix · CNA Open62541 (o6 Automation GmbH) Fixed in 1.5-rc2
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2026-1301
- 2026-10-03 Alias added: GHSA-c8xh-89h3-73pj
References
More o6 Automation vulnerabilities
- TI-2026-45266 o6 Automation open62541 Integer Overflow or Wraparound CVSS 4.0HIGH 8.7
- TI-2026-46601 o6 Automation open62541 Integer Overflow or Wraparound CVSS 4.0HIGH 8.7
- TI-2026-45175 o6 Automation open62541 Integer Underflow CVSS 4.0HIGH 8.2
- TI-2026-45012 o6 Automation open62541 Use After Free CVSS 4.0HIGH 7.2
Sources
- CVE-2026-1301 · CVE Program
- CVE-2026-1301 · NVD
- FIRST EPSS
- GHSA-c8xh-89h3-73pj · GitHub Advisory Database · CC BY 4.0
- CVE-2026-1301 · Red Hat security data · CC BY 4.0
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