CVE-2026-63362
5.9
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| o6 Automation | open62541 | 1.3.0 <= 1.3.17 | affected |
| o6 Automation | open62541 | 1.4.0 <= 1.4.16 | affected |
| o6 Automation | open62541 | 1.5.0 <= 1.5.4 | affected |
| o6 Automation | open62541 | master | affected |
Weaknesses
- CWE-191: CWE-191
References
- 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
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