{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-19795","assignerOrgId":"9a959283-ebb5-44b6-b705-dcc2bbced522","state":"PUBLISHED","assignerShortName":"ibm","dateReserved":"2026-08-13T19:40:18.000Z","datePublished":"2026-09-03T19:56:03.172Z","dateUpdated":"2026-09-04T20:05:30.490Z"},"containers":{"cna":{"providerMetadata":{"orgId":"9a959283-ebb5-44b6-b705-dcc2bbced522","shortName":"ibm","dateUpdated":"2026-09-04T20:05:30.490Z"},"title":"Qiskit SDK is vulnerable when deserializing QPY Files and may overflow the available stack space.","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":"2.1.0","lessThanOrEqual":"2.5.1","versionType":"semver"}],"defaultStatus":"unaffected","cpes":["cpe:2.3:a:ibm:qiskit_sdk:2.1.0:*:*:*:*:*:*:*","cpe:2.3:a:ibm:qiskit_sdk:2.5.1:*:*:*:*:*:*:*"]}],"descriptions":[{"lang":"en","value":"Qiskit could allow a local attacker to cause a denial of service due to a stack overflow during deserialization of QPY payloads. A malicious QPY payload can trigger a segmentation fault, causing the application to crash when deserializing untrusted input.","supportingMedia":[{"type":"text/html","base64":false,"value":"<p>Qiskit could allow a local attacker to cause a denial of service due to a stack overflow during deserialization of QPY payloads. A malicious QPY payload can trigger a segmentation fault, causing the application to crash when deserializing untrusted input.&nbsp;&nbsp;</p>"}]}],"references":[{"url":"https://www.ibm.com/support/pages/node/7285932","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 v2.5.2. This version is patched to prevent the stack overflow by no longer evaluating the expression tree for ParameterExpression objects recursively.\n\n\n\nProduct(s)Version(s) number and/or range Remediation/Fix/Instructions<Qiskit SDK - qiskit.qpy.load() function>v2.5.2\n\nUpgrade to the patched versions: qiskit v2.5.2.","supportingMedia":[{"type":"text/html","base64":false,"value":"<p><strong>Remediation/Fixes guidance</strong>:</p><p>The issue is addressed in Qiskit versions v2.5.2. This version is patched to prevent the stack overflow by no longer evaluating the expression tree for ParameterExpression objects recursively.<br/><br/></p><div><table><tbody><tr><td><strong>Product(s)</strong></td><td><strong>Version(s) number and/or range </strong></td><td><strong>Remediation/Fix/Instructions</strong></td></tr><tr><td>&lt;Qiskit SDK - qiskit.qpy.load() function&gt;</td><td>v2.5.2</td><td><pre>Upgrade to the patched versions: qiskit v2.5.2.</pre></td></tr></tbody></table></div><p></p><p></p>"}]}],"credits":[{"lang":"en","value":"Issue discovered by Matthew Treinish (IBM) and Takashi Imamichi (IBM)","type":"finder"}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 1.0.5"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-04T13:26:19.128569Z","id":"CVE-2026-19795","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-09-04T13:41:31.310Z"}}]}}