CVE-2026-18784: o6 open62541 ua_client_highlevel.c UA_Client_readNodeClassAttribute heap-based overflow

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-04 · updated 2026-10-24
Weakness: CWE-119

Description

A vulnerability was found in o6 open62541 up to 1.5.5. This issue affects the function UA_Client_readNodeClassAttribute of the file src/client/ua_client_highlevel.c. Performing a manipulation results in heap-based buffer overflow. Attacking locally is a requirement. The exploit has been made public and could be used. The project closed the issue report, stating that this is not the official way to report a security vulnerability.

Affected products

o6 open62541: 1.5.0, 1.5.1, 1.5.2, 1.5.3, 1.5.4, 1.5.5

References

https://github.com/gff-cw/information/issues/11
https://github.com/open62541/open62541/issues/8139
https://vuldb.com/cve/CVE-2026-18784
https://vuldb.com/submit/857012
https://vuldb.com/vuln/385786
https://vuldb.com/vuln/385786/cti

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