What’s Vulnerable › Vulnerabilities

CVE-2026-67857

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-04 · updated 2026-08-31
• Weakness: CWE-125

Description

open62541 1.5.5 contains an out-of-bounds read in the client-side function responseReadNamespacesArray() in src/client/ua_client_connect.c.

References

• https://github.com/gff-cw/information/issues/9
• https://github.com/open62541/open62541/blob/v1.5.5/examples/client_connect.c
• https://github.com/open62541/open62541/blob/v1.5.5/examples/client_connect_loop.c
• https://github.com/open62541/open62541/blob/v1.5.5/src/client/ua_client_connect.c
• https://github.com/open62541/open62541/issues/8104
• https://github.com/open62541/open62541/issues/8104

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