CVE-2026-116500

MEDIUM 6.2

Unbound Recursion in QPY deserialization can lead to denial of service

CVSS Score

6.2

EPSS Score

0.0%

EPSS Percentile

0th

IBM Qiskit SDK 2.4.0 through 2.6.1 could allow a local attacker to cause a denial of service due to unbound recursion during deserialization of untrusted QPY payloads.

CWE	CWE-502
Vendor	ibm
Product	qiskit sdk
Published	Nov 8, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

IBM / Qiskit SDK

2.4.0 ≤ 2.6.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

ibm.com: https://www.ibm.com/support/pages/node/7295235

Credits

The vulnerability was reported to IBM by Nathan Rebello.