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
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| o6 | open62541 | 1.5.0, 1.5.1, 1.5.2, 1.5.3, 1.5.4, 1.5.5 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | open62541 | No fix yet | — |
| Debian 13 | open62541 | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | open62541 | No fix yet | — |
| Ubuntu 26.04 LTS | open62541 | No fix yet | — |
References
- VDB-385786 | o6 open62541 ua_client_highlevel.c UA_Client_readNodeClassAttribute heap-based overflow vdb-entry technical-description
- VDB-385786 | CTI Indicators (IOB, IOC, IOA) signature permissions-required
- CVE-2026-18784 | CVE Analysis and Report third-party-advisory
- Submit #857012 | open62541 Project open62541 master (commit ca356b088ada7dee824d1b4acd07c1ff07ce242b) Heap-based Buffer Overflow (Out-of-Bounds Read) third-party-advisory
- https://github.com/open62541/open62541/issues/8139 issue-tracking
- https://github.com/gff-cw/information/issues/11 exploit issue-tracking