o6 Automation open62541 Integer Underflow
Priority LOW 39CWE-191Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Attack requirements
- None
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-191 and the CVSS impact.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01822 78th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
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 | 1.3.0 – 1.3.17; 1.4.0 – 1.4.16; 1.5.0 – 1.5.4; master | — | No fix listed | CNA |
- open62541 Vendoro6 Automation Affected 1.3.0 – 1.3.17; 1.4.0 – 1.4.16; 1.5.0 – 1.5.4; master Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2026-63362
- 2026-10-03 Alias added: GHSA-qv76-j3j3-2f94
References
Other 7
- https://www.o6-automation.com/contact
- https://github.com/open62541/open62541/pull/8235/commits/b666d35769ce63998442e4d0810a3fb10b50179f
- https://github.com/open62541/open62541/pull/8236/commits/06b99fef667c8ec5bdf0605b4f00c84fcc1d3a60
- https://github.com/open62541/open62541/pull/8237/commits/1b71d9c5d9c4d02d4729b8903a52e9f530bf804e
- https://github.com/open62541/open62541/pull/8238/commits/afab4107bfd161da9ce8bb30ed77f3968c9c97df
- https://www.cisa.gov/news-events/ics-advisories/icsa-26-211-08
- https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-211-08.json
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-2026-45012 o6 Automation open62541 Use After Free CVSS 4.0HIGH 7.2
- TI-2026-01016 Out-of-bounds Write in o6 Automation GmbH Open62541 CVSS 4.0MEDIUM 6.8
Sources
- CVE-2026-63362 · CVE Program
- CVE-2026-63362 · NVD
- FIRST EPSS
- GHSA-qv76-j3j3-2f94 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-63362 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences