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qiskit.qpy.load() function&gt;</td><td>v2.6.2</td><td><pre>Upgrade to the patched versions: qiskit v2.6.2.</pre></td></tr></tbody></table></div><p></p><p></p>"}],"value":"Remediation/Fixes guidance:\n\n\n\nThe issue is addressed in Qiskit versions v2.6.2.\n\n\n\nProduct(s)Version(s) number and/or range Remediation/Fix/Instructions< Qiskit SDK https://github.com/qiskit/qiskit  - qiskit.qpy.load() function>v2.6.2\n\nUpgrade to the patched versions: qiskit v2.6.2."}],"title":"Unbound Recursion in QPY deserialization can lead to denial of service","workarounds":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"<p><strong>Workarounds/Mitigation guidance</strong>:</p><p><br/>None</p><p></p>"}],"value":"Workarounds/Mitigation guidance:\n\n\n\n\nNone"}]}},"cveMetadata":{"assignerOrgId":"9a959283-ebb5-44b6-b705-dcc2bbced522","assignerShortName":"ibm","cveId":"CVE-2026-116500","datePublished":"2026-11-08T17:04:53.713Z","dateReserved":"2026-10-26T12:59:16.329Z","dateUpdated":"2026-11-08T17:04:53.713Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-11-08 17:16:37","lastModifiedDate":"2026-11-08 17:16:37","problem_types":["CWE-502","CWE-502 CWE-502 Deserialization of Untrusted Data"],"metrics":{"cvssMetricV31":[{"source":"psirt@us.ibm.com","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":6.2,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":2.5,"impactScore":3.6}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"116500","Ordinal":"1","Title":"Unbound Recursion in QPY deserialization can lead to denial of s","CVE":"CVE-2026-116500","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"116500","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"Unbound Recursion in QPY deserialization can lead to denial of s"}]}}}