Vulnerability-Lookup

FKIE_CVE-2026-11836

Vulnerability from fkie_nvd - Published: 2026-08-04 00:16 - Updated: 2026-09-03 16:43

Severity

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

Summary

Insufficient verification of data authenticity in Caliptra Core ROM and Core Firmware (validate_debug_unlock_token()) in subsystem mode allows an attacker with access to the integrator's debug unlock signing service to unlock production debug on an unintended device by presenting a valid token issued for a different device sharing the same debug unlock key hash. The 384-bit challenge nonce continues to prevent replay of previously issued tokens. Practical impact is limited to loss of per-device scope enforcement within a set of devices that share the same unlock authority by design; it does not enable debug unlock on devices outside that set. This issue affects Core ROM: 2.0.0 through 2.0.2, 2.1.0 through 2.1.1; Core Firmware: 2.0.0 through 2.0.1, 2.1.0.

References

	URL	Tags
	b01ddd03-5ef6-483b-b2c5-acba77f1a554	https://github.com/chipsalliance/caliptra-sw/security/advisories/GHSA-hw68-jjx4-m376

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://github.com/chipsalliance/caliptra-sw",
          "defaultStatus": "unaffected",
          "modules": [
            "validate_debug_unlock_token()"
          ],
          "packageName": "Core ROM",
          "product": "Core ROM",
          "vendor": "Caliptra",
          "versions": [
            {
              "lessThanOrEqual": "2.0.2",
              "status": "affected",
              "version": "2.0.0",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "2.0.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "2.1.1",
              "status": "affected",
              "version": "2.1.0",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "2.1.2",
              "versionType": "semver"
            }
          ]
        },
        {
          "collectionURL": "https://github.com/chipsalliance/caliptra-sw",
          "defaultStatus": "unaffected",
          "modules": [
            "validate_debug_unlock_token()"
          ],
          "packageName": "Core Firmware",
          "product": "Core Firmware",
          "vendor": "Caliptra",
          "versions": [
            {
              "lessThanOrEqual": "2.0.1",
              "status": "affected",
              "version": "2.0.0",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "2.0.2",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "2.1.0",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "2.1.1",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "b01ddd03-5ef6-483b-b2c5-acba77f1a554"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Insufficient verification of data authenticity in Caliptra Core ROM and Core Firmware (validate_debug_unlock_token()) in subsystem mode allows an attacker with access to the integrator\u0027s debug unlock signing service to unlock production debug on an unintended device by presenting a valid token issued for a different device sharing the same debug unlock key hash. The 384-bit challenge nonce continues to prevent replay of previously issued tokens. Practical impact is limited to loss of per-device scope enforcement within a set of devices that share the same unlock authority by design; it does not enable debug unlock on devices outside that set.\n\nThis issue affects Core ROM: 2.0.0 through 2.0.2, 2.1.0 through 2.1.1; Core Firmware: 2.0.0 through 2.0.1, 2.1.0."
    }
  ],
  "id": "CVE-2026-11836",
  "lastModified": "2026-09-03T16:43:15.293",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "PRESENT",
          "attackVector": "LOCAL",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 1.8,
          "baseSeverity": "LOW",
          "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": "HIGH",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:L/VI:L/VA:N/SC:N/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": "NONE",
          "vulnConfidentialityImpact": "LOW",
          "vulnIntegrityImpact": "LOW",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "b01ddd03-5ef6-483b-b2c5-acba77f1a554",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-11836",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-04T19:24:52.944825Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-04T00:16:40.203",
  "references": [
    {
      "source": "b01ddd03-5ef6-483b-b2c5-acba77f1a554",
      "url": "https://github.com/chipsalliance/caliptra-sw/security/advisories/GHSA-hw68-jjx4-m376"
    }
  ],
  "sourceIdentifier": "b01ddd03-5ef6-483b-b2c5-acba77f1a554",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-345"
        }
      ],
      "source": "b01ddd03-5ef6-483b-b2c5-acba77f1a554",
      "type": "Secondary"
    }
  ]
}

CVE-2026-11836 (GCVE-0-2026-11836)

Vulnerability from cvelistv5 – Published: 2026-08-04 00:02 – Updated: 2026-08-04 21:25 X_Open Source

Title

Production Debug-Unlock Token Verification Missing Device Binding

Summary

Severity

1.8 (Low)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-04 19:24 UTC

CWE

CWE-345 - Insufficient Verification of Data Authenticity

Assigner

Caliptra mitre root

References

1 reference

URL	Tags
https://github.com/chipsalliance/caliptra-sw/secu…

Impacted products

2 products

Vendor	Product	Version
Caliptra	Core ROM	Affected: 2.0.0 , ≤ 2.0.2 (semver) Unaffected: 2.0.3 (semver) Affected: 2.1.0 , ≤ 2.1.1 (semver) Unaffected: 2.1.2 (semver)
Caliptra	Core Firmware	Affected: 2.0.0 , ≤ 2.0.1 (semver) Unaffected: 2.0.2 (semver) Affected: 2.1.0 (semver) Unaffected: 2.1.1 (semver)

Date Public

2026-08-03 00:00

Credits

Alex Matrosov with Claude, Anthropic

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-11836",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-04T19:24:52.944825Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-04T19:25:11.267Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://github.com/chipsalliance/caliptra-sw",
          "defaultStatus": "unaffected",
          "modules": [
            "validate_debug_unlock_token()"
          ],
          "packageName": "Core ROM",
          "product": "Core ROM",
          "vendor": "Caliptra",
          "versions": [
            {
              "lessThanOrEqual": "2.0.2",
              "status": "affected",
              "version": "2.0.0",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "2.0.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "2.1.1",
              "status": "affected",
              "version": "2.1.0",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "2.1.2",
              "versionType": "semver"
            }
          ]
        },
        {
          "collectionURL": "https://github.com/chipsalliance/caliptra-sw",
          "defaultStatus": "unaffected",
          "modules": [
            "validate_debug_unlock_token()"
          ],
          "packageName": "Core Firmware",
          "product": "Core Firmware",
          "vendor": "Caliptra",
          "versions": [
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              "status": "affected",
              "version": "2.0.0",
              "versionType": "semver"
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              "version": "2.1.1",
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          "type": "finder",
          "value": "Alex Matrosov with Claude, Anthropic"
        }
      ],
      "datePublic": "2026-08-03T00:00:00.000Z",
      "descriptions": [
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          "supportingMedia": [
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      "impacts": [
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          "capecId": "CAPEC-115",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-115 Authentication Bypass"
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      "metrics": [
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            "subConfidentialityImpact": "NONE",
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            "valueDensity": "NOT_DEFINED",
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            "vulnAvailabilityImpact": "NONE",
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            "vulnerabilityResponseEffort": "NOT_DEFINED"
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        "orgId": "b01ddd03-5ef6-483b-b2c5-acba77f1a554",
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      "references": [
        {
          "url": "https://github.com/chipsalliance/caliptra-sw/security/advisories/GHSA-hw68-jjx4-m376"
        }
      ],
      "source": {
        "discovery": "INTERNAL"
      },
      "tags": [
        "x_open-source"
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      "title": "Production Debug-Unlock Token Verification Missing Device Binding",
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    "datePublished": "2026-08-04T00:02:34.093Z",
    "dateReserved": "2026-06-09T23:30:40.399Z",
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    "state": "PUBLISHED"
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}

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.