Vulnerability-Lookup

CVE-2026-42274 (GCVE-0-2026-42274)

Vulnerability from cvelistv5 – Published: 2026-05-08 03:43 – Updated: 2026-05-11 18:20

Title

Heimdall: Authorization bypass via path normalization mismatch

Summary

Heimdall is a cloud native Identity Aware Proxy and Access Control Decision service. Prior to version 0.17.14, Heimdall performs rule matching on the raw (non-normalized) request path, while downstream components may normalize dot-segments according to RFC 3986, Section 6.2.2.3. This discrepancy can result in heimdall authorizing a request for one path (e.g., /user/../admin, or URL-encoded variants such as /user/%2e%2e/admin or /user/%2e%2e%2fadmin. The latter would require the allow_encoded_slashes option to be set to on or no_decode.) while the downstream ultimately processes a different, normalized path (/admin). This issue has been patched in version 0.17.14.

Severity

7.8 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-11 18:19 UTC

CWE

CWE-35 - Path Traversal: '.../...//'
CWE-436 - Interpretation Conflict

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7797 records in the last 180 days details

References

4 references

URL	Tags
https://github.com/dadrus/heimdall/security/advis…	x_refsource_CONFIRM
https://github.com/dadrus/heimdall/pull/3209	x_refsource_MISC
https://github.com/dadrus/heimdall/commit/b5dfa48…	x_refsource_MISC
https://github.com/dadrus/heimdall/releases/tag/v…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
dadrus	heimdall	Affected: < 0.17.14	guessed

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-42274",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-11T18:19:37.764124Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-11T18:20:15.059Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "heimdall",
          "vendor": "dadrus",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.17.14"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Heimdall is a cloud native Identity Aware Proxy and Access Control Decision service. Prior to version 0.17.14, Heimdall performs rule matching on the raw (non-normalized) request path, while downstream components may normalize dot-segments according to RFC 3986, Section 6.2.2.3. This discrepancy can result in heimdall authorizing a request for one path (e.g., /user/../admin, or URL-encoded variants such as /user/%2e%2e/admin or /user/%2e%2e%2fadmin. The latter would require the allow_encoded_slashes option to be set to on or no_decode.) while the downstream ultimately processes a different, normalized path (/admin). This issue has been patched in version 0.17.14."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "HIGH",
            "subIntegrityImpact": "HIGH",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-35",
              "description": "CWE-35: Path Traversal: \u0027.../...//\u0027",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-436",
              "description": "CWE-436: Interpretation Conflict",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-08T03:43:41.597Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/dadrus/heimdall/security/advisories/GHSA-3q34-rx83-r6mq",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/dadrus/heimdall/security/advisories/GHSA-3q34-rx83-r6mq"
        },
        {
          "name": "https://github.com/dadrus/heimdall/pull/3209",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/dadrus/heimdall/pull/3209"
        },
        {
          "name": "https://github.com/dadrus/heimdall/commit/b5dfa484b7a8c2ce6d8691c026f9da867719947a",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/dadrus/heimdall/commit/b5dfa484b7a8c2ce6d8691c026f9da867719947a"
        },
        {
          "name": "https://github.com/dadrus/heimdall/releases/tag/v0.17.14",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/dadrus/heimdall/releases/tag/v0.17.14"
        }
      ],
      "source": {
        "advisory": "GHSA-3q34-rx83-r6mq",
        "discovery": "UNKNOWN"
      },
      "title": "Heimdall: Authorization bypass via path normalization mismatch"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-42274",
    "datePublished": "2026-05-08T03:43:41.597Z",
    "dateReserved": "2026-04-26T11:53:27.707Z",
    "dateUpdated": "2026-05-11T18:20:15.059Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-42274",
      "date": "2026-10-26",
      "epss": "0.00368",
      "percentile": "0.30459"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "product": "heimdall",
                "vendor": "dadrus",
                "versions": [
                  {
                    "status": "affected",
                    "version": "\u003c 0.17.14"
                  }
                ]
              }
            ],
            "source": "security-advisories@github.com"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "Heimdall is a cloud native Identity Aware Proxy and Access Control Decision service. Prior to version 0.17.14, Heimdall performs rule matching on the raw (non-normalized) request path, while downstream components may normalize dot-segments according to RFC 3986, Section 6.2.2.3. This discrepancy can result in heimdall authorizing a request for one path (e.g., /user/../admin, or URL-encoded variants such as /user/%2e%2e/admin or /user/%2e%2e%2fadmin. The latter would require the allow_encoded_slashes option to be set to on or no_decode.) while the downstream ultimately processes a different, normalized path (/admin). This issue has been patched in version 0.17.14."
          },
          {
            "lang": "es",
            "value": "Heimdall es un servicio nativo de la nube de Proxy consciente de la identidad y de decisi\u00f3n de control de acceso. Antes de la versi\u00f3n 0.17.14, Heimdall realiza la coincidencia de reglas en la ruta de solicitud cruda (no normalizada), mientras que los componentes posteriores pueden normalizar los segmentos de puntos seg\u00fan la RFC 3986, Secci\u00f3n 6.2.2.3. Esta discrepancia puede resultar en que Heimdall autorice una solicitud para una ruta (por ejemplo, /user/.. / admin, o variantes codificadas en URL como /user/%2e%2e/admin o /user/%2e%2e%2fadmin. Esto \u00faltimo requerir\u00eda que la opci\u00f3n allow_encoded_slashes se establezca en \u2019on\u2019 o \u2019no_decode\u2019.) mientras que el componente posterior finalmente procesa una ruta diferente y normalizada (/admin). Este problema ha sido parcheado en la versi\u00f3n 0.17.14."
          }
        ],
        "id": "CVE-2026-42274",
        "lastModified": "2026-10-26T20:10:00.160",
        "metrics": {
          "cvssMetricV40": [
            {
              "cvssData": {
                "Automatable": "NOT_DEFINED",
                "Recovery": "NOT_DEFINED",
                "Safety": "NOT_DEFINED",
                "attackComplexity": "LOW",
                "attackRequirements": "NONE",
                "attackVector": "NETWORK",
                "availabilityRequirement": "NOT_DEFINED",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "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": "HIGH",
                "userInteraction": "NONE",
                "valueDensity": "NOT_DEFINED",
                "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/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": "NONE",
                "vulnIntegrityImpact": "NONE",
                "vulnerabilityResponseEffort": "NOT_DEFINED"
              },
              "source": "security-advisories@github.com",
              "type": "Secondary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2026-42274",
                "options": [
                  {
                    "exploitation": "none"
                  },
                  {
                    "automatable": "yes"
                  },
                  {
                    "technicalImpact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-11T18:19:37.764124Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2026-05-08T04:16:22.643",
        "references": [
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/dadrus/heimdall/commit/b5dfa484b7a8c2ce6d8691c026f9da867719947a"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/dadrus/heimdall/pull/3209"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/dadrus/heimdall/releases/tag/v0.17.14"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/dadrus/heimdall/security/advisories/GHSA-3q34-rx83-r6mq"
          }
        ],
        "sourceIdentifier": "security-advisories@github.com",
        "vulnStatus": "Deferred",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-35"
              },
              {
                "lang": "en",
                "value": "CWE-436"
              }
            ],
            "source": "security-advisories@github.com",
            "type": "Secondary"
          }
        ]
      }
    },
    "redhat_vex": {
      "current_release_date": "2026-05-11T20:25:48+00:00",
      "cve": "CVE-2026-42274",
      "id": "CVE-2026-42274",
      "initial_release_date": "2026-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "Heimdall: Authorization bypass via path normalization mismatch",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42274.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-42274",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "yes"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-05-11T18:19:37.764124Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-05-11T18:20:00.585Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "product": "heimdall",
              "vendor": "dadrus",
              "versions": [
                {
                  "status": "affected",
                  "version": "\u003c 0.17.14"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "Heimdall is a cloud native Identity Aware Proxy and Access Control Decision service. Prior to version 0.17.14, Heimdall performs rule matching on the raw (non-normalized) request path, while downstream components may normalize dot-segments according to RFC 3986, Section 6.2.2.3. This discrepancy can result in heimdall authorizing a request for one path (e.g., /user/../admin, or URL-encoded variants such as /user/%2e%2e/admin or /user/%2e%2e%2fadmin. The latter would require the allow_encoded_slashes option to be set to on or no_decode.) while the downstream ultimately processes a different, normalized path (/admin). This issue has been patched in version 0.17.14."
            }
          ],
          "metrics": [
            {
              "cvssV4_0": {
                "attackComplexity": "LOW",
                "attackRequirements": "NONE",
                "attackVector": "NETWORK",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "privilegesRequired": "NONE",
                "subAvailabilityImpact": "NONE",
                "subConfidentialityImpact": "HIGH",
                "subIntegrityImpact": "HIGH",
                "userInteraction": "NONE",
                "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N",
                "version": "4.0",
                "vulnAvailabilityImpact": "NONE",
                "vulnConfidentialityImpact": "NONE",
                "vulnIntegrityImpact": "NONE"
              }
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-35",
                  "description": "CWE-35: Path Traversal: \u0027.../...//\u0027",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            },
            {
              "descriptions": [
                {
                  "cweId": "CWE-436",
                  "description": "CWE-436: Interpretation Conflict",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-05-08T03:43:41.597Z",
            "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
            "shortName": "GitHub_M"
          },
          "references": [
            {
              "name": "https://github.com/dadrus/heimdall/security/advisories/GHSA-3q34-rx83-r6mq",
              "tags": [
                "x_refsource_CONFIRM"
              ],
              "url": "https://github.com/dadrus/heimdall/security/advisories/GHSA-3q34-rx83-r6mq"
            },
            {
              "name": "https://github.com/dadrus/heimdall/pull/3209",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/dadrus/heimdall/pull/3209"
            },
            {
              "name": "https://github.com/dadrus/heimdall/commit/b5dfa484b7a8c2ce6d8691c026f9da867719947a",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/dadrus/heimdall/commit/b5dfa484b7a8c2ce6d8691c026f9da867719947a"
            },
            {
              "name": "https://github.com/dadrus/heimdall/releases/tag/v0.17.14",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/dadrus/heimdall/releases/tag/v0.17.14"
            }
          ],
          "source": {
            "advisory": "GHSA-3q34-rx83-r6mq",
            "discovery": "UNKNOWN"
          },
          "title": "Heimdall: Authorization bypass via path normalization mismatch"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "assignerShortName": "GitHub_M",
        "cveId": "CVE-2026-42274",
        "datePublished": "2026-05-08T03:43:41.597Z",
        "dateReserved": "2026-04-26T11:53:27.707Z",
        "dateUpdated": "2026-05-11T18:20:15.059Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}

FKIE_CVE-2026-42274

Vulnerability from fkie_nvd - Published: 2026-05-08 04:16 - Updated: 2026-10-26 20:10

Severity

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

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/dadrus/heimdall/commit/b5dfa484b7a8c2ce6d8691c026f9da867719947a
	security-advisories@github.com	https://github.com/dadrus/heimdall/pull/3209
	security-advisories@github.com	https://github.com/dadrus/heimdall/releases/tag/v0.17.14
	security-advisories@github.com	https://github.com/dadrus/heimdall/security/advisories/GHSA-3q34-rx83-r6mq

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "heimdall",
          "vendor": "dadrus",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.17.14"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Heimdall is a cloud native Identity Aware Proxy and Access Control Decision service. Prior to version 0.17.14, Heimdall performs rule matching on the raw (non-normalized) request path, while downstream components may normalize dot-segments according to RFC 3986, Section 6.2.2.3. This discrepancy can result in heimdall authorizing a request for one path (e.g., /user/../admin, or URL-encoded variants such as /user/%2e%2e/admin or /user/%2e%2e%2fadmin. The latter would require the allow_encoded_slashes option to be set to on or no_decode.) while the downstream ultimately processes a different, normalized path (/admin). This issue has been patched in version 0.17.14."
    },
    {
      "lang": "es",
      "value": "Heimdall es un servicio nativo de la nube de Proxy consciente de la identidad y de decisi\u00f3n de control de acceso. Antes de la versi\u00f3n 0.17.14, Heimdall realiza la coincidencia de reglas en la ruta de solicitud cruda (no normalizada), mientras que los componentes posteriores pueden normalizar los segmentos de puntos seg\u00fan la RFC 3986, Secci\u00f3n 6.2.2.3. Esta discrepancia puede resultar en que Heimdall autorice una solicitud para una ruta (por ejemplo, /user/.. / admin, o variantes codificadas en URL como /user/%2e%2e/admin o /user/%2e%2e%2fadmin. Esto \u00faltimo requerir\u00eda que la opci\u00f3n allow_encoded_slashes se establezca en \u2019on\u2019 o \u2019no_decode\u2019.) mientras que el componente posterior finalmente procesa una ruta diferente y normalizada (/admin). Este problema ha sido parcheado en la versi\u00f3n 0.17.14."
    }
  ],
  "id": "CVE-2026-42274",
  "lastModified": "2026-10-26T20:10:00.160",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "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": "HIGH",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/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": "NONE",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-42274",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-05-11T18:19:37.764124Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-05-08T04:16:22.643",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/dadrus/heimdall/commit/b5dfa484b7a8c2ce6d8691c026f9da867719947a"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/dadrus/heimdall/pull/3209"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/dadrus/heimdall/releases/tag/v0.17.14"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/dadrus/heimdall/security/advisories/GHSA-3q34-rx83-r6mq"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-35"
        },
        {
          "lang": "en",
          "value": "CWE-436"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

GHSA-3Q34-RX83-R6MQ

Vulnerability from github – Published: 2026-04-25 23:30 – Updated: 2026-05-12 13:29

Summary

Heimdall has an authorization bypass via path normalization mismatch

Details

Summary

Heimdall performs rule matching on the raw (non-normalized) request path, while downstream components may normalize dot-segments according to RFC 3986, Section 6.2.2.3. This discrepancy can result in heimdall authorizing a request for one path (e.g., /user/../admin, or URL-encoded variants such as /user/%2e%2e/admin or /user/%2e%2e%2fadmin. The latter would require the allow_encoded_slashes option to be set to on or no_decode.) while the downstream ultimately processes a different, normalized path (/admin).

Details

This vulnerability can be exploited by an adversary if rule matching is performed using free (named or unnamed) wildcards without further constraints, as shown in the example snippets below.

id: rule-1
match:
  routes:
    - path: /user/**
execute: # configured to require authentication and authorization
  # ...

id: rule-2
match:
  routes:
    - path: /public/**
execute: # configured to allow anonymous access
  # ...

If an adversary sends a request to /public/../user/whatever, rule-2 will be matched and executed. The downstream service may, however, normalize the request path and interpret it as /user/whatever.

Impact

Bypass of access control policies enforced by heimdall may lead to the following consequences:

Access to or modification of data that should be restricted
Invocation of functionality that is expected to require authentication or authorization
In certain configurations, escalation of privileges depending on the exposed functionality

Workarounds

Normalize HTTP paths or reject HTTP paths containing relative path expressions in the layers in front of Heimdall - this is good practice anyway. Some proxies do that by default, such as Traefik; others, such as Envoy, require additional configuration (for Envoy see normalize_path).
Include the ID of the rule expected to be executed in the JWT issued by heimdall and check that value in the consuming project's service.

Severity

7.8 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/dadrus/heimdall"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.17.14"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-42274"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-35",
      "CWE-436"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-25T23:30:46Z",
    "nvd_published_at": "2026-05-08T04:16:22Z",
    "severity": "HIGH"
  },
  "details": "### Summary\n\nHeimdall performs rule matching on the raw (non-normalized) request path, while downstream components may normalize dot-segments according to [RFC 3986, Section 6.2.2.3](https://www.rfc-editor.org/rfc/rfc3986#section-6.2.2.3). This discrepancy can result in heimdall authorizing a request for one path (e.g., `/user/../admin`, or URL-encoded variants such as `/user/%2e%2e/admin` or `/user/%2e%2e%2fadmin`. The latter would require the `allow_encoded_slashes` option to be set to `on` or `no_decode`.) while the downstream ultimately processes a different, normalized path (`/admin`).\n\n### Details\n\nThis vulnerability can be exploited by an adversary if rule matching is performed using free (named or unnamed) wildcards without further constraints, as shown in the example snippets below.\n\n```yaml\nid: rule-1\nmatch:\n  routes:\n    - path: /user/**\nexecute: # configured to require authentication and authorization\n  # ...\n```\n\n```yaml\nid: rule-2\nmatch:\n  routes:\n    - path: /public/**\nexecute: # configured to allow anonymous access\n  # ...\n```\n\nIf an adversary sends a request to `/public/../user/whatever`, rule-2 will be matched and executed. The downstream service may, however, normalize the request path and interpret it as `/user/whatever`.\n\n### Impact\n\nBypass of access control policies enforced by heimdall may lead to the following consequences:\n\n* Access to or modification of data that should be restricted\n* Invocation of functionality that is expected to require authentication or authorization\n* In certain configurations, escalation of privileges depending on the exposed functionality\n\n### Workarounds\n\n* Normalize HTTP paths or reject HTTP paths containing relative path expressions in the layers in front of Heimdall - this is good practice anyway. Some proxies do that by default, such as Traefik; others, such as Envoy, require additional configuration (for Envoy see [`normalize_path`](https://www.envoyproxy.io/docs/envoy/latest/api-v3/extensions/filters/network/http_connection_manager/v3/http_connection_manager.proto#envoy-v3-api-field-extensions-filters-network-http-connection-manager-v3-httpconnectionmanager-normalize-path)).\n* Include the ID of the rule expected to be executed in the JWT issued by heimdall and check that value in the consuming project\u0027s service.",
  "id": "GHSA-3q34-rx83-r6mq",
  "modified": "2026-05-12T13:29:02Z",
  "published": "2026-04-25T23:30:46Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/dadrus/heimdall/security/advisories/GHSA-3q34-rx83-r6mq"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42274"
    },
    {
      "type": "WEB",
      "url": "https://github.com/dadrus/heimdall/pull/3209"
    },
    {
      "type": "WEB",
      "url": "https://github.com/dadrus/heimdall/commit/b5dfa484b7a8c2ce6d8691c026f9da867719947a"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/dadrus/heimdall"
    },
    {
      "type": "WEB",
      "url": "https://github.com/dadrus/heimdall/releases/tag/v0.17.14"
    },
    {
      "type": "WEB",
      "url": "https://www.envoyproxy.io/docs/envoy/latest/api-v3/extensions/filters/network/http_connection_manager/v3/http_connection_manager.proto#envoy-v3-api-field-extensions-filters-network-http-connection-manager-v3-httpconnectionmanager-normalize-path"
    },
    {
      "type": "WEB",
      "url": "https://www.rfc-editor.org/rfc/rfc3986#section-6.2.2.3"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Heimdall has an authorization bypass via path normalization mismatch"
}

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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

Publication & reservation Sightings KEV catalogs Other timestamps

Loading timeline…

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.

Action not permitted

CVE-2026-42274 (GCVE-0-2026-42274)

FKIE_CVE-2026-42274

GHSA-3Q34-RX83-R6MQ

Summary

Details

Impact

Workarounds

Tags

Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour