{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-116500", "assignerOrgId": "9a959283-ebb5-44b6-b705-dcc2bbced522", "state": "PUBLISHED", "assignerShortName": "ibm", "dateReserved": "2026-10-26T12:59:16.329Z", "datePublished": "2026-11-08T17:04:53.713Z", "dateUpdated": "2026-11-08T17:04:53.713Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "9a959283-ebb5-44b6-b705-dcc2bbced522", "shortName": "ibm", "dateUpdated": "2026-11-08T17:04:53.713Z"}, "title": "Unbound Recursion in QPY deserialization can lead to denial of service", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-502", "description": "CWE-502 Deserialization of Untrusted Data", "type": "CWE"}]}], "affected": [{"vendor": "IBM", "product": "Qiskit SDK", "versions": [{"status": "affected", "version": "2.4.0", "lessThanOrEqual": "2.6.1", "versionType": "semver"}], "cpes": ["cpe:2.3:a:ibm:qiskit_sdk:2.4.0:*:*:*:*:*:*:*", "cpe:2.3:a:ibm:qiskit_sdk:2.6.1:*:*:*:*:*:*:*"]}], "descriptions": [{"lang": "en", "value": "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.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>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.</p>"}]}], "references": [{"url": "https://www.ibm.com/support/pages/node/7295235", "tags": ["vendor-advisory", "patch"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH", "baseSeverity": "MEDIUM", "baseScore": 6.2, "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}}], "workarounds": [{"lang": "en", "value": "Workarounds/Mitigation guidance:\n\n\n\n\nNone", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p><strong>Workarounds/Mitigation guidance</strong>:</p><p><br/>None</p><p></p>"}]}], "solutions": [{"lang": "en", "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\u00a0Remediation/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.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p><strong>Remediation/Fixes guidance</strong>:</p><p>The issue is addressed in Qiskit versions v2.6.2.<br/><br/></p><div><table><tbody><tr><td><strong>Product(s)</strong></td><td><strong>Version(s) number and/or range\u00a0</strong></td><td><strong>Remediation/Fix/Instructions</strong></td></tr><tr><td>&lt;<a href=\"https://github.com/qiskit/qiskit\" rel=\"nofollow\">Qiskit SDK</a> - 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>"}]}], "credits": [{"lang": "en", "value": "The vulnerability was reported to IBM by Nathan Rebello.", "type": "finder"}]}}}

{}

{"affected": [{"affectedData": [{"cpes": ["cpe:2.3:a:ibm:qiskit_sdk:2.4.0:*:*:*:*:*:*:*", "cpe:2.3:a:ibm:qiskit_sdk:2.6.1:*:*:*:*:*:*:*"], "product": "Qiskit SDK", "vendor": "IBM", "versions": [{"lessThanOrEqual": "2.6.1", "status": "affected", "version": "2.4.0", "versionType": "semver"}]}], "source": "psirt@us.ibm.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-116500", "lastModified": "2026-11-08T17:16:37.113", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 6.2, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.5, "impactScore": 3.6, "source": "psirt@us.ibm.com", "type": "Primary"}]}, "published": "2026-11-08T17:16:37.007", "references": [{"source": "psirt@us.ibm.com", "url": "https://www.ibm.com/support/pages/node/7295235"}], "sourceIdentifier": "psirt@us.ibm.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-502"}], "source": "psirt@us.ibm.com", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2.4.0,2.6.1]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Qiskit SDK", "source": "cna", "vendor": "IBM"}, "product": "qiskit_sdk", "vendor": "ibm"}], "created": "2026-11-08T18:30:11.971053+00:00", "updated": "2026-11-08T19:00:13.835215+00:00", "vendors": ["ibm", "ibm$PRODUCT$qiskit_sdk"]}