o6 Automation open62541 Integer Underflow
Summary
| CVE | CVE-2026-63362 |
|---|---|
| State | PUBLISHED |
| Assigner | icscert |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-07-30 23:16:52 UTC |
| Updated | 2026-07-31 16:17:09 UTC |
| Description | 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. |
Risk And Classification
Primary CVSS: v4.0 8.2 HIGH from [email protected]
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS: 0.015280000 probability, percentile 0.722170000 (date 2026-08-03)
Problem Types: CWE-191 | CWE-191 CWE-191
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 4.0 | [email protected] | Secondary | 8.2 | HIGH | CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/C... |
| 4.0 | CNA | CVSS | 8.2 | HIGH | CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N |
| 3.1 | [email protected] | Secondary | 5.9 | MEDIUM | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |
| 3.1 | CNA | CVSS | 5.9 | MEDIUM | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |
CVSS v4.0 Breakdown
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS v3.1 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | O6 Automation | Open62541 | affected 1.3.0 1.3.17 custom | Windows, Linux |
| CNA | O6 Automation | Open62541 | affected 1.4.0 1.4.16 custom | Windows, Linux |
| CNA | O6 Automation | Open62541 | affected 1.5.0 1.5.4 custom | Windows, Linux |
| CNA | O6 Automation | Open62541 | affected master | Windows, Linux |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| github.com/open62541/open62541/pull/8237/commits/1b71d9c5d9c4d02d4729b89... | [email protected] | github.com | |
| github.com/open62541/open62541/pull/8238/commits/afab4107bfd161da9ce8bb3... | [email protected] | github.com | |
| github.com/open62541/open62541/pull/8236/commits/06b99fef667c8ec5bdf0605... | [email protected] | github.com | |
| github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-21... | [email protected] | github.com | |
| github.com/open62541/open62541/pull/8235/commits/b666d35769ce63998442e4d... | [email protected] | github.com | |
| www.o6-automation.com/contact | [email protected] | www.o6-automation.com | |
| www.cisa.gov/news-events/ics-advisories/icsa-26-211-08 | [email protected] | www.cisa.gov | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Abhinav Agarwal reported this vulnerability to CISA. (en)
Additional Advisory Data
Solutions
CNA: o6 Automation has prepared mitigations and fixes to address these issues and recommends that users update to the newest version. The new version can be obtained by contacting o6 Automation https://www.o6-automation.com/contact or by downloading from the following locations: 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 For more information, see open62541 Security Advisories SA-2026-0012, SA-2026-0014, and SA-2026-0015 or contact o6 Automation: https://www.o6-automation.com/contact