9.2
Critical
open62541 1.5.0 before 1.5.7 contains an integer overflow in UADataTypefromStructureDescription() that wraps the 16-bit memSize field for…
CVE-2026-116014
open62541 1.5.0 before 1.5.7 contains an integer overflow in UADataTypefromStructureDescription() that wraps the 16-bit memSize field for large custom structure definitions. A malicious OPC UA server can supply DataType definitions via UAClientgetRemoteDataTypes(), causing decodeBinaryStructure() to overflow the heap, crashing clients or enabling code execution.
Assessment
- CVSS
- 9.2 (v4.0)
- Severity
- Critical
- Known exploited
- Not listed in CISA KEV
- Exploit availability
- Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
- Published
- 24 October 2026
- Last updated
- 29 October 2026
- Weakness
- CWE-190
- Assigner
- disclosure@vulncheck.com
CVSS vectorCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
At the source
References
- https://github.com/open62541/open62541/blob/v1.5.6/src/ua_types_definition.c#L274
- https://github.com/open62541/open62541/commit/0cf4806768c493bc6ccffcd4419da24153b970ec
- https://github.com/open62541/open62541/pull/8298
- https://github.com/open62541/open62541/pull/8302
- https://github.com/open62541/open62541/releases/tag/v1.5.7
- https://www.vulncheck.com/advisories/open62541-1.5.0-before-1.5.7-integer-overflow-heap-buffer-overflow-via-custom-datatype
Query this programmatically
Agents can read this through the MCP endpoint, or over HTTP:
curl https://cve.zerocrew.in/api/cve/CVE-2026-116014