CVE-2026-4870: IBM Qiskit Software Development Kit

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

IBM Qiskit SDK 0.43.0 through 2.5.0 could allow an attacker to trigger a segmentation fault leading to a denial of service due to uncontrolled recursion in the parser.

Affected products

• IBM Qiskit Software Development Kit: from 0.43.0, before 1.4.6 (fixed in 1.4.6); from 2.0.0, before 2.4.2 (fixed in 2.4.2)

Published 2026-06-12. Last modified 2026-06-17.