Vulnerability-Lookup

CVE-2026-18796 (GCVE-0-2026-18796)

Vulnerability from cvelistv5 – Published: 2026-09-07 08:07 – Updated: 2026-09-08 15:01

Title

QSPI flash encryption side-channel leakage

Summary

Any application that uses external QSPI flash for encrypted XIP on nRF5340 and relies on that encryption for confidentiality and/or integrity of the externally stored code. No specific nRF Connect SDK version is the root cause; the weakness is in the on-the-fly decryption scheme.

Severity

6.8 (Medium)


                        
                          CVSS:4.0/AV:P/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:N/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-08 15:01 UTC

CWE

CWE-1342 - Information exposure through microarchitectural state after transient execution

Assigner

YesWeHack ENISA root

References

1 reference

URL	Tags
https://docs.nordicsemi.com/r/bundle/struct_sa/pa…

Impacted products

1 product

Vendor	Product	Version	CPE status
Nordic Semiconductor ASA	nRF5340	Affected: All build codes	guessed

Credits

Reported externally through PSIRT by Daniël Eijkmann and Damian Vizár (CSEM)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-18796",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-08T15:01:20.642344Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-08T15:01:26.689Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "nRF5340",
          "vendor": "Nordic Semiconductor ASA",
          "versions": [
            {
              "status": "affected",
              "version": "All build codes"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "Reported externally through PSIRT by Dani\u00ebl Eijkmann and Damian Viz\u00e1r (CSEM)"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cspan\u003eAny application that\n     uses external QSPI flash for encrypted XIP on nRF5340 and relies on that\n     encryption for confidentiality and/or integrity of the externally stored\n     code. No specific nRF Connect SDK version is the root cause; the weakness\n     is in the on-the-fly decryption scheme.\u003c/span\u003e\u003cbr\u003e"
            }
          ],
          "value": "Any application that\n     uses external QSPI flash for encrypted XIP on nRF5340 and relies on that\n     encryption for confidentiality and/or integrity of the externally stored\n     code. No specific nRF Connect SDK version is the root cause; the weakness\n     is in the on-the-fly decryption scheme."
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-37",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-37 Retrieve Embedded Sensitive Data"
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "HIGH",
            "attackRequirements": "PRESENT",
            "attackVector": "PHYSICAL",
            "baseScore": 6.8,
            "baseSeverity": "MEDIUM",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "HIGH",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:P/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-1342",
              "description": "CWE-1342 Information exposure through microarchitectural state after transient execution",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-07T08:07:31.633Z",
        "orgId": "30a5e7fb-040d-440a-8cdf-a4a2068ce72e",
        "shortName": "YesWeHack"
      },
      "references": [
        {
          "url": "https://docs.nordicsemi.com/r/bundle/struct_sa/page/struct/sa.html"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "QSPI flash encryption side-channel leakage",
      "x_generator": {
        "engine": "Vulnogram 1.0.4"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "30a5e7fb-040d-440a-8cdf-a4a2068ce72e",
    "assignerShortName": "YesWeHack",
    "cveId": "CVE-2026-18796",
    "datePublished": "2026-09-07T08:07:31.633Z",
    "dateReserved": "2026-08-04T09:40:15.178Z",
    "dateUpdated": "2026-09-08T15:01:26.689Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-18796",
      "date": "2026-09-09",
      "epss": "0.00079",
      "percentile": "0.00149"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-18796\",\"sourceIdentifier\":\"30a5e7fb-040d-440a-8cdf-a4a2068ce72e\",\"published\":\"2026-09-07T09:17:15.570\",\"lastModified\":\"2026-09-09T15:50:19.447\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Any application that\\n     uses external QSPI flash for encrypted XIP on nRF5340 and relies on that\\n     encryption for confidentiality and/or integrity of the externally stored\\n     code. No specific nRF Connect SDK version is the root cause; the weakness\\n     is in the on-the-fly decryption scheme.\"}],\"affected\":[{\"source\":\"30a5e7fb-040d-440a-8cdf-a4a2068ce72e\",\"affectedData\":[{\"vendor\":\"Nordic Semiconductor ASA\",\"product\":\"nRF5340\",\"defaultStatus\":\"unaffected\",\"versions\":[{\"version\":\"All build codes\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV40\":[{\"source\":\"30a5e7fb-040d-440a-8cdf-a4a2068ce72e\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"4.0\",\"vectorString\":\"CVSS:4.0/AV:P/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X\",\"baseScore\":6.8,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"PHYSICAL\",\"attackComplexity\":\"HIGH\",\"attackRequirements\":\"PRESENT\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"vulnConfidentialityImpact\":\"HIGH\",\"vulnIntegrityImpact\":\"HIGH\",\"vulnAvailabilityImpact\":\"HIGH\",\"subConfidentialityImpact\":\"HIGH\",\"subIntegrityImpact\":\"NONE\",\"subAvailabilityImpact\":\"NONE\",\"exploitMaturity\":\"NOT_DEFINED\",\"confidentialityRequirement\":\"NOT_DEFINED\",\"integrityRequirement\":\"NOT_DEFINED\",\"availabilityRequirement\":\"NOT_DEFINED\",\"modifiedAttackVector\":\"NOT_DEFINED\",\"modifiedAttackComplexity\":\"NOT_DEFINED\",\"modifiedAttackRequirements\":\"NOT_DEFINED\",\"modifiedPrivilegesRequired\":\"NOT_DEFINED\",\"modifiedUserInteraction\":\"NOT_DEFINED\",\"modifiedVulnConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedVulnIntegrityImpact\":\"NOT_DEFINED\",\"modifiedVulnAvailabilityImpact\":\"NOT_DEFINED\",\"modifiedSubConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedSubIntegrityImpact\":\"NOT_DEFINED\",\"modifiedSubAvailabilityImpact\":\"NOT_DEFINED\",\"Safety\":\"NOT_DEFINED\",\"Automatable\":\"NOT_DEFINED\",\"Recovery\":\"NOT_DEFINED\",\"valueDensity\":\"NOT_DEFINED\",\"vulnerabilityResponseEffort\":\"NOT_DEFINED\",\"providerUrgency\":\"NOT_DEFINED\"}}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-09-08T15:01:20.642344Z\",\"id\":\"CVE-2026-18796\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"total\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"30a5e7fb-040d-440a-8cdf-a4a2068ce72e\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-1342\"}]}],\"references\":[{\"url\":\"https://docs.nordicsemi.com/r/bundle/struct_sa/page/struct/sa.html\",\"source\":\"30a5e7fb-040d-440a-8cdf-a4a2068ce72e\"}]}}",
    "vulnrichment": {
      "containers": "{\"cna\": {\"title\": \"QSPI flash encryption side-channel leakage\", \"source\": {\"discovery\": \"UNKNOWN\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"reporter\", \"value\": \"Reported externally through PSIRT by Dani\\u00ebl Eijkmann and Damian Viz\\u00e1r (CSEM)\"}], \"impacts\": [{\"capecId\": \"CAPEC-37\", \"descriptions\": [{\"lang\": \"en\", \"value\": \"CAPEC-37 Retrieve Embedded Sensitive Data\"}]}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV4_0\": {\"Safety\": \"NOT_DEFINED\", \"version\": \"4.0\", \"Recovery\": \"NOT_DEFINED\", \"baseScore\": 6.8, \"Automatable\": \"NOT_DEFINED\", \"attackVector\": \"PHYSICAL\", \"baseSeverity\": \"MEDIUM\", \"valueDensity\": \"NOT_DEFINED\", \"vectorString\": \"CVSS:4.0/AV:P/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:N/SA:N\", \"exploitMaturity\": \"NOT_DEFINED\", \"providerUrgency\": \"NOT_DEFINED\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"HIGH\", \"attackRequirements\": \"PRESENT\", \"privilegesRequired\": \"NONE\", \"subIntegrityImpact\": \"NONE\", \"vulnIntegrityImpact\": \"HIGH\", \"subAvailabilityImpact\": \"NONE\", \"vulnAvailabilityImpact\": \"HIGH\", \"subConfidentialityImpact\": \"HIGH\", \"vulnConfidentialityImpact\": \"HIGH\", \"vulnerabilityResponseEffort\": \"NOT_DEFINED\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"vendor\": \"Nordic Semiconductor ASA\", \"product\": \"nRF5340\", \"versions\": [{\"status\": \"affected\", \"version\": \"All build codes\"}], \"defaultStatus\": \"unaffected\"}], \"references\": [{\"url\": \"https://docs.nordicsemi.com/r/bundle/struct_sa/page/struct/sa.html\"}], \"x_generator\": {\"engine\": \"Vulnogram 1.0.4\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"Any application that\\n     uses external QSPI flash for encrypted XIP on nRF5340 and relies on that\\n     encryption for confidentiality and/or integrity of the externally stored\\n     code. No specific nRF Connect SDK version is the root cause; the weakness\\n     is in the on-the-fly decryption scheme.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cspan\u003eAny application that\\n     uses external QSPI flash for encrypted XIP on nRF5340 and relies on that\\n     encryption for confidentiality and/or integrity of the externally stored\\n     code. No specific nRF Connect SDK version is the root cause; the weakness\\n     is in the on-the-fly decryption scheme.\u003c/span\u003e\u003cbr\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-1342\", \"description\": \"CWE-1342 Information exposure through microarchitectural state after transient execution\"}]}], \"providerMetadata\": {\"orgId\": \"30a5e7fb-040d-440a-8cdf-a4a2068ce72e\", \"shortName\": \"YesWeHack\", \"dateUpdated\": \"2026-09-07T08:07:31.633Z\"}}, \"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-18796\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-09-08T15:01:20.642344Z\"}}}], \"providerMetadata\": {\"shortName\": \"CISA-ADP\", \"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"dateUpdated\": \"2026-09-08T15:01:23.790Z\"}}]}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-18796\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-09-07T08:07:31.633Z\", \"dateReserved\": \"2026-08-04T09:40:15.178Z\", \"assignerOrgId\": \"30a5e7fb-040d-440a-8cdf-a4a2068ce72e\", \"datePublished\": \"2026-09-07T08:07:31.633Z\", \"assignerShortName\": \"YesWeHack\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}

FKIE_CVE-2026-18796

Vulnerability from fkie_nvd - Published: 2026-09-07 09:17 - Updated: 2026-09-09 15:50

Severity

6.8 (Medium) - CVSS:4.0/AV:P/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:N/SA:N

Summary

References

	URL	Tags
	30a5e7fb-040d-440a-8cdf-a4a2068ce72e	https://docs.nordicsemi.com/r/bundle/struct_sa/page/struct/sa.html

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "nRF5340",
          "vendor": "Nordic Semiconductor ASA",
          "versions": [
            {
              "status": "affected",
              "version": "All build codes"
            }
          ]
        }
      ],
      "source": "30a5e7fb-040d-440a-8cdf-a4a2068ce72e"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Any application that\n     uses external QSPI flash for encrypted XIP on nRF5340 and relies on that\n     encryption for confidentiality and/or integrity of the externally stored\n     code. No specific nRF Connect SDK version is the root cause; the weakness\n     is in the on-the-fly decryption scheme."
    }
  ],
  "id": "CVE-2026-18796",
  "lastModified": "2026-09-09T15:50:19.447",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "HIGH",
          "attackRequirements": "PRESENT",
          "attackVector": "PHYSICAL",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 6.8,
          "baseSeverity": "MEDIUM",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "HIGH",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:P/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "HIGH",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "HIGH",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "30a5e7fb-040d-440a-8cdf-a4a2068ce72e",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-18796",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-09-08T15:01:20.642344Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-09-07T09:17:15.570",
  "references": [
    {
      "source": "30a5e7fb-040d-440a-8cdf-a4a2068ce72e",
      "url": "https://docs.nordicsemi.com/r/bundle/struct_sa/page/struct/sa.html"
    }
  ],
  "sourceIdentifier": "30a5e7fb-040d-440a-8cdf-a4a2068ce72e",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-1342"
        }
      ],
      "source": "30a5e7fb-040d-440a-8cdf-a4a2068ce72e",
      "type": "Secondary"
    }
  ]
}

GHSA-Q9VX-6FW9-4MV8

Vulnerability from github – Published: 2026-09-07 09:31 – Updated: 2026-09-07 09:31

Details

Severity

6.8 (Medium)


                  
                    CVSS:4.0/AV:P/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:N/SA:N

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-18796"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1342"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-07T09:17:15Z",
    "severity": "MODERATE"
  },
  "details": "Any application that\n     uses external QSPI flash for encrypted XIP on nRF5340 and relies on that\n     encryption for confidentiality and/or integrity of the externally stored\n     code. No specific nRF Connect SDK version is the root cause; the weakness\n     is in the on-the-fly decryption scheme.",
  "id": "GHSA-q9vx-6fw9-4mv8",
  "modified": "2026-09-07T09:31:40Z",
  "published": "2026-09-07T09:31:40Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-18796"
    },
    {
      "type": "WEB",
      "url": "https://docs.nordicsemi.com/r/bundle/struct_sa/page/struct/sa.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:P/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

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-2026-18796 (GCVE-0-2026-18796)

FKIE_CVE-2026-18796

GHSA-Q9VX-6FW9-4MV8

Tags

Sightings

Nomenclature