{"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\u00a0Remediation/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\u00a0</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"}}]}}

{"dataType": "CVE_RECORD", "containers": {"cna": {"title": "Qiskit SDK is vulnerable when deserializing QPY Files and may overflow the available stack space.", "credits": [{"lang": "en", "type": "finder", "value": "Issue discovered by Matthew Treinish (IBM) and Takashi Imamichi (IBM)"}], "metrics": [{"format": "CVSS", "cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.2, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "affected": [{"cpes": ["cpe:2.3:a:ibm:qiskit_sdk:2.1.0:*:*:*:*:*:*:*", "cpe:2.3:a:ibm:qiskit_sdk:2.5.1:*:*:*:*:*:*:*"], "vendor": "IBM", "product": "Qiskit SDK", "versions": [{"status": "affected", "version": "2.1.0", "versionType": "semver", "lessThanOrEqual": "2.5.1"}]}], "solutions": [{"lang": "en", "value": "Remediation/Fixes guidance:\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\nProduct(s)Version(s) number and/or range Remediation/Fix/Instructions<Qiskit SDK - qiskit.qpy.load() function>v2.5.2Upgrade to the patched versions: qiskit v2.5.2.", "supportingMedia": [{"type": "text/html", "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\u00a0</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>", "base64": false}]}], "references": [{"url": "https://www.ibm.com/support/pages/node/7285932", "tags": ["vendor-advisory", "patch"]}], "workarounds": [{"lang": "en", "value": "Workarounds/Mitigation guidance:\n\nNone", "supportingMedia": [{"type": "text/html", "value": "<p><strong>Workarounds/Mitigation guidance</strong>:</p><p><br/>None</p><p></p>", "base64": false}]}], "descriptions": [{"lang": "en", "value": "IBM Qiskit SDK 2.1.0 through 2.5.1 could allow a local attacker to cause a denial of service due to improper handling of a specially crafted object during deserialization. A malicious QPY payload can trigger a segmentation fault, causing the application to crash when deserializing untrusted input.", "supportingMedia": [{"type": "text/html", "value": "<p>IBM Qiskit SDK 2.1.0 through 2.5.1 could allow a local attacker to cause a denial of service due to improper handling of a specially crafted object during deserialization. A malicious QPY payload can trigger a segmentation fault, causing the application to crash when deserializing untrusted input.</p>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-502", "description": "CWE-502 Deserialization of Untrusted Data"}]}], "providerMetadata": {"orgId": "9a959283-ebb5-44b6-b705-dcc2bbced522", "shortName": "ibm", "dateUpdated": "2026-09-03T19:56:03.172Z"}}, "adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-19795", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-09-04T13:26:19.128569Z"}}}], "providerMetadata": {"shortName": "CISA-ADP", "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "dateUpdated": "2026-09-04T13:26:20.465Z"}}]}, "cveMetadata": {"cveId": "CVE-2026-19795", "state": "PUBLISHED", "dateUpdated": "2026-09-03T19:56:03.172Z", "dateReserved": "2026-08-13T19:40:18.000Z", "assignerOrgId": "9a959283-ebb5-44b6-b705-dcc2bbced522", "datePublished": "2026-09-03T19:56:03.172Z", "assignerShortName": "ibm"}, "dataVersion": "5.2"}

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{}

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