CVE-2026-116501 – Qiskit SDK C API may trigger an out of bounds write on accessing the unitary matrix with qk_circuit_inst_unitary().

​CVE ID :CVE-2026-116501

Published : Nov. 8, 2026, 5:16 p.m. | 1 hour, 3 minutes ago

Description :IBM Qiskit SDK 2.4.0 through 2.6.1 could allow a local attacker to execute arbitrary code due to an out-of-bounds write caused by improper input validation when accessing a corrupted unitary matrix.

Severity: 8.4 | HIGH

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