Out-of-Bounds Write Vulnerability in IBM Qiskit SDK
CVE-2026-116501

8.4HIGH

Key Information:

Vendor

IBM
Status
Qiskit Sdk
Vendor
CVE Published:
8 November 2026

What is CVE-2026-116501?

IBM Qiskit SDK versions 2.4.0 through 2.6.1 are susceptible to an out-of-bounds write vulnerability. This issue arises due to inadequate input validation when interacting with a corrupted unitary matrix, potentially allowing a local attacker to execute arbitrary code. Users are advised to review their implementations and apply necessary patches to mitigate risks associated with this vulnerability.

Affected Version(s)

Qiskit SDK 2.4.0 <= 2.6.1

References

https://www.ibm.com/support/pages/node/7295237
vendor-advisorypatch

CVSS V3.1

Score:
8.4
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

The vulnerability was reported to IBM by Nathan Rebello.
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