CVE-2026-67870

criticalCVSS 9.8covered by 1 sourcefirst seen 2026-08-06

In open62541 v1.5.5, the server-side AddReferences implementation contains an incomplete validation flaw for non-local ExpandedNodeId targets. A remote attacker can send a crafted AddReferencesRequest with an empty targetServerUri and a non-zero targetNodeId.serverIndex, causing the target node pointer to remain NULL while execution continues.

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Exploitation outlook

Low exploitation risk0.27% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 19% of all EPSS-scored CVEs.

Advisory coverage (1)

criticalCVE-2026-67870: In open62541 v1.5.5, the server-side AddReferences implementation contains an incomplete valid…nvd · 2026-08-06

External references

NVD record for CVE-2026-67870

CVE.org record

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