Qiskit SDK is vulnerable to specific functions may recurse too deeply and overflow the available stack space, when encountering certain classical expressions.
CVE-2026-4870

7.5HIGH

Key Information:

Vendor

IBM
Status
Qiskit Sdk
Vendor
CVE Published:
12 June 2026

What is CVE-2026-4870?

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 Version(s)

Qiskit SDK 0.43.0 <= 2.5.0

References

https://www.ibm.com/support/pages/node/7276123
vendor-advisorypatch

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

This vulnerability was reported to IBM by Ali Sherif.
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