Denial of Service Vulnerability in IBM Qiskit SDK Affects Multiple Versions
CVE-2026-116500

6.2MEDIUM

Key Information:

Vendor

IBM
Status
Qiskit Sdk
Vendor
CVE Published:
8 November 2026

What is CVE-2026-116500?

The IBM Qiskit SDK versions 2.4.0 through 2.6.1 are vulnerable to a denial of service attack. A local attacker can exploit this vulnerability by sending malformed QPY payloads, leading to unbounded recursion during the deserialization process. This flaw could result in a service disruption, making the application unavailable to legitimate users. To mitigate this issue, it is advisable to upgrade to the latest version of the SDK or implement specific patches provided by IBM.

Affected Version(s)

Qiskit SDK 2.4.0 <= 2.6.1

References

https://www.ibm.com/support/pages/node/7295235
vendor-advisorypatch

CVSS V3.1

Score:
6.2
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
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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