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Vulnerability · Published Jul 30, 2026 · Assigned by icscert

CVE-2026-63035o6 Automation open62541 Use After Free

High 8.1

In plain English

A high-severity use-after-free 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 0.8% (higher than 55% of all known vulnerabilities).

Severity (CVSS 3.1)8.1High
Exploit odds (30 days)0.8%top 44.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

A heap use-after-free vulnerability in the TransferSubscriptions service in open62541 may allow an authenticated attacker to cause a denial of service or potentially execute arbitrary code.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:13open62541no fix listedDEBIAN-CVE-2026-63035
Debian:14open62541no fix listedDEBIAN-CVE-2026-63035
Ubuntu:26.04:LTSopen62541no fix listedUBUNTU-CVE-2026-63035
Ubuntu:26.10open62541no fix listedUBUNTU-CVE-2026-63035

Affected products (as reported)

VendorProductVersions
o6 Automation open62541 1.3.0 – through 1.3.171.4.0 – through 1.4.161.5.0 – through 1.5.4master

Weakness: CWE-416 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

References