Vulnerability-Lookup

CVE-2026-19795 (GCVE-0-2026-19795)

Vulnerability from cvelistv5 – Published: 2026-09-03 19:56 – Updated: 2026-09-04 20:05

Title

Qiskit SDK is vulnerable when deserializing QPY Files and may overflow the available stack space.

Summary

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.

Severity

6.2 (Medium)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-04 13:26 UTC

CWE

CWE-502 - Deserialization of Untrusted Data

Assigner

ibm mitre root

References

1 reference

URL	Tags
https://www.ibm.com/support/pages/node/7285932	vendor-advisorypatch

Impacted products

1 product

Vendor	Product	Version	CPE status
IBM	Qiskit SDK	Affected: 2.1.0 , ≤ 2.5.1 (semver) cpe:2.3:a:ibm:qiskit_sdk:2.1.0:::::::* cpe:2.3:a:ibm:qiskit_sdk:2.5.1:::::::*

Credits

Issue discovered by Matthew Treinish (IBM) and Takashi Imamichi (IBM)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-19795",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-04T13:26:19.128569Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-04T13:41:31.310Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "cpes": [
            "cpe:2.3:a:ibm:qiskit_sdk:2.1.0:*:*:*:*:*:*:*",
            "cpe:2.3:a:ibm:qiskit_sdk:2.5.1:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unaffected",
          "product": "Qiskit SDK",
          "vendor": "IBM",
          "versions": [
            {
              "lessThanOrEqual": "2.5.1",
              "status": "affected",
              "version": "2.1.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Issue discovered by Matthew Treinish (IBM) and Takashi Imamichi (IBM)"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eQiskit 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.\u0026nbsp;\u0026nbsp;\u003c/p\u003e"
            }
          ],
          "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "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"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-502",
              "description": "CWE-502 Deserialization of Untrusted Data",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-04T20:05:30.490Z",
        "orgId": "9a959283-ebb5-44b6-b705-dcc2bbced522",
        "shortName": "ibm"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory",
            "patch"
          ],
          "url": "https://www.ibm.com/support/pages/node/7285932"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003e\u003cstrong\u003eRemediation/Fixes guidance\u003c/strong\u003e:\u003c/p\u003e\u003cp\u003eThe 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.\u003cbr/\u003e\u003cbr/\u003e\u003c/p\u003e\u003cdiv\u003e\u003ctable\u003e\u003ctbody\u003e\u003ctr\u003e\u003ctd\u003e\u003cstrong\u003eProduct(s)\u003c/strong\u003e\u003c/td\u003e\u003ctd\u003e\u003cstrong\u003eVersion(s) number and/or range\u00a0\u003c/strong\u003e\u003c/td\u003e\u003ctd\u003e\u003cstrong\u003eRemediation/Fix/Instructions\u003c/strong\u003e\u003c/td\u003e\u003c/tr\u003e\u003ctr\u003e\u003ctd\u003e\u0026lt;Qiskit SDK - qiskit.qpy.load() function\u0026gt;\u003c/td\u003e\u003ctd\u003ev2.5.2\u003c/td\u003e\u003ctd\u003e\u003cpre\u003eUpgrade to the patched versions: qiskit v2.5.2.\u003c/pre\u003e\u003c/td\u003e\u003c/tr\u003e\u003c/tbody\u003e\u003c/table\u003e\u003c/div\u003e\u003cp\u003e\u003c/p\u003e\u003cp\u003e\u003c/p\u003e"
            }
          ],
          "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\u003cQiskit SDK - qiskit.qpy.load() function\u003ev2.5.2\n\nUpgrade to the patched versions: qiskit v2.5.2."
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "Qiskit SDK is vulnerable when deserializing QPY Files and may overflow the available stack space.",
      "workarounds": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003e\u003cstrong\u003eWorkarounds/Mitigation guidance\u003c/strong\u003e:\u003c/p\u003e\u003cp\u003e\u003cbr/\u003eNone\u003c/p\u003e\u003cp\u003e\u003c/p\u003e"
            }
          ],
          "value": "Workarounds/Mitigation guidance:\n\n\n\n\nNone"
        }
      ],
      "x_generator": {
        "engine": "Vulnogram 1.0.5"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "9a959283-ebb5-44b6-b705-dcc2bbced522",
    "assignerShortName": "ibm",
    "cveId": "CVE-2026-19795",
    "datePublished": "2026-09-03T19:56:03.172Z",
    "dateReserved": "2026-08-13T19:40:18.000Z",
    "dateUpdated": "2026-09-04T20:05:30.490Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-19795",
      "date": "2026-09-10",
      "epss": "0.00112",
      "percentile": "0.01501"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-19795\",\"sourceIdentifier\":\"psirt@us.ibm.com\",\"published\":\"2026-09-03T20:17:19.790\",\"lastModified\":\"2026-09-08T14:17:08.940\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"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.\"}],\"affected\":[{\"source\":\"psirt@us.ibm.com\",\"affectedData\":[{\"vendor\":\"IBM\",\"product\":\"Qiskit SDK\",\"defaultStatus\":\"unaffected\",\"cpes\":[\"cpe:2.3:a:ibm:qiskit_sdk:2.1.0:*:*:*:*:*:*:*\",\"cpe:2.3:a:ibm:qiskit_sdk:2.5.1:*:*:*:*:*:*:*\"],\"versions\":[{\"version\":\"2.1.0\",\"lessThanOrEqual\":\"2.5.1\",\"versionType\":\"semver\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"psirt@us.ibm.com\",\"type\":\"Secondary\",\"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}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-09-04T13:26:19.128569Z\",\"id\":\"CVE-2026-19795\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"psirt@us.ibm.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-502\"}]}],\"references\":[{\"url\":\"https://www.ibm.com/support/pages/node/7285932\",\"source\":\"psirt@us.ibm.com\"}]}}",
    "vulnrichment": {
      "containers": "{\"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\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-09-04T13:26:20.465Z\"}}], \"cna\": {\"title\": \"Qiskit SDK is vulnerable when deserializing QPY Files and may overflow the available stack space.\", \"source\": {\"discovery\": \"UNKNOWN\"}, \"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\"}], \"defaultStatus\": \"unaffected\"}], \"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\u003cQiskit SDK - qiskit.qpy.load() function\u003ev2.5.2\\n\\nUpgrade to the patched versions: qiskit v2.5.2.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003e\u003cstrong\u003eRemediation/Fixes guidance\u003c/strong\u003e:\u003c/p\u003e\u003cp\u003eThe 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.\u003cbr/\u003e\u003cbr/\u003e\u003c/p\u003e\u003cdiv\u003e\u003ctable\u003e\u003ctbody\u003e\u003ctr\u003e\u003ctd\u003e\u003cstrong\u003eProduct(s)\u003c/strong\u003e\u003c/td\u003e\u003ctd\u003e\u003cstrong\u003eVersion(s) number and/or range\\u00a0\u003c/strong\u003e\u003c/td\u003e\u003ctd\u003e\u003cstrong\u003eRemediation/Fix/Instructions\u003c/strong\u003e\u003c/td\u003e\u003c/tr\u003e\u003ctr\u003e\u003ctd\u003e\u0026lt;Qiskit SDK - qiskit.qpy.load() function\u0026gt;\u003c/td\u003e\u003ctd\u003ev2.5.2\u003c/td\u003e\u003ctd\u003e\u003cpre\u003eUpgrade to the patched versions: qiskit v2.5.2.\u003c/pre\u003e\u003c/td\u003e\u003c/tr\u003e\u003c/tbody\u003e\u003c/table\u003e\u003c/div\u003e\u003cp\u003e\u003c/p\u003e\u003cp\u003e\u003c/p\u003e\", \"base64\": false}]}], \"references\": [{\"url\": \"https://www.ibm.com/support/pages/node/7285932\", \"tags\": [\"vendor-advisory\", \"patch\"]}], \"workarounds\": [{\"lang\": \"en\", \"value\": \"Workarounds/Mitigation guidance:\\n\\n\\n\\n\\nNone\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003e\u003cstrong\u003eWorkarounds/Mitigation guidance\u003c/strong\u003e:\u003c/p\u003e\u003cp\u003e\u003cbr/\u003eNone\u003c/p\u003e\u003cp\u003e\u003c/p\u003e\", \"base64\": false}]}], \"x_generator\": {\"engine\": \"Vulnogram 1.0.5\"}, \"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\", \"value\": \"\u003cp\u003eQiskit 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.\u0026nbsp;\u0026nbsp;\u003c/p\u003e\", \"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\": \"2026-09-04T20:05:30.490Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-19795\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-09-04T20:05:30.490Z\", \"dateReserved\": \"2026-08-13T19:40:18.000Z\", \"assignerOrgId\": \"9a959283-ebb5-44b6-b705-dcc2bbced522\", \"datePublished\": \"2026-09-03T19:56:03.172Z\", \"assignerShortName\": \"ibm\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}

FKIE_CVE-2026-19795

Vulnerability from fkie_nvd - Published: 2026-09-03 20:17 - Updated: 2026-09-08 14:17

Severity

6.2 (Medium) - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Summary

References

	URL	Tags
	psirt@us.ibm.com	https://www.ibm.com/support/pages/node/7285932

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "cpes": [
            "cpe:2.3:a:ibm:qiskit_sdk:2.1.0:*:*:*:*:*:*:*",
            "cpe:2.3:a:ibm:qiskit_sdk:2.5.1:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unaffected",
          "product": "Qiskit SDK",
          "vendor": "IBM",
          "versions": [
            {
              "lessThanOrEqual": "2.5.1",
              "status": "affected",
              "version": "2.1.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "psirt@us.ibm.com"
    }
  ],
  "cveTags": [],
  "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."
    }
  ],
  "id": "CVE-2026-19795",
  "lastModified": "2026-09-08T14:17:08.940",
  "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": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-19795",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-09-04T13:26:19.128569Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-09-03T20:17:19.790",
  "references": [
    {
      "source": "psirt@us.ibm.com",
      "url": "https://www.ibm.com/support/pages/node/7285932"
    }
  ],
  "sourceIdentifier": "psirt@us.ibm.com",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-502"
        }
      ],
      "source": "psirt@us.ibm.com",
      "type": "Secondary"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2026-19795 (GCVE-0-2026-19795)

FKIE_CVE-2026-19795

Tags

Sightings

Nomenclature