What is CVE-2026-116500?

CVE-2026-116500 is a medium-severity vulnerability in IBM Qiskit Sdk, classified under Deserialization of Untrusted Data. CVSS score: 6.2/10. Published 2026-11-08.

How severe is CVE-2026-116500?

Medium severity. CVSS v3 base score is 6.2 out of 10.

Deserialization in IBM Qiskit Sdk

CVE-2026-116500

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.

Vulnerability class: Insecure Deserialization

Published 2026-11-08 · last modified 2026-11-08.

CVSS v3 metric

CVSS v3 base score 6.2 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

IBM Qiskit Sdk

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

www.ibm.com/support/pages/node/7295235 (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-116500?: CVE-2026-116500 is a medium-severity vulnerability in IBM Qiskit Sdk, classified under Deserialization of Untrusted Data. CVSS score: 6.2/10. Published 2026-11-08.
How severe is CVE-2026-116500?: Medium severity. CVSS v3 base score is 6.2 out of 10.