Vulnerability · Published Jul 30, 2026 · Assigned by icscert
CVE-2026-63559o6 Automation open62541 Integer Overflow or Wraparound
High 7.5
In plain English
A high-severity integer overflow in open62541 from o6 Automation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 53% of all known vulnerabilities).
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.7%top 46.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
An integer overflow in the UA_Variant arrayDimensions product computation in open62541 may allow a remote attacker to read out-of-bounds heap memory, potentially disclosing sensitive information.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:13 | open62541 | no fix listed | DEBIAN-CVE-2026-63559 |
| Debian:14 | open62541 | no fix listed | DEBIAN-CVE-2026-63559 |
| Ubuntu:26.04:LTS | open62541 | no fix listed | UBUNTU-CVE-2026-63559 |
| Ubuntu:26.10 | open62541 | no fix listed | UBUNTU-CVE-2026-63559 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| o6 Automation | open62541 | 1.3.0 – through 1.3.171.4.0 – through 1.4.161.5.0 – through 1.5.4master |
Weakness: CWE-190 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
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