CVE-2026-75899 (GCVE-0-2026-75899)

Vulnerability from cvelistv5 – Published: 2026-08-24 09:40 – Updated: 2026-08-24 16:19
VLAI
Title
fast-uri vulnerable to server-side request forgery via repeated hostname percent-decoding
Summary
fast-uri is a URI parser for Node.js. It decodes percent escapes in a hostname during parsing and then decodes the parsed hostname a second time during authority recomposition, so a single call to normalize or resolve can turn nested percent-encoded input into a different network destination such as a loopback hostname or address. For example, a doubly encoded host that spells out a loopback name decodes to that live host in one operation, which contradicts RFC 3986 section 2.4 that an implementation must not decode the same string more than once. An application that normalizes or resolves an untrusted HTTP-family URI before outbound routing, redirect validation, or a host-policy check can receive a destination different from the one the original encoded host represented, giving a server-side request forgery and host-policy bypass primitive. This is an incomplete-fix variant of CVE-2026-6322. The affected versions are 2.4.1 up to but not including 2.4.5, 3.1.2 up to but not including 3.1.6, and 4.0.0 up to but not including 4.1.3. The issue is fixed in 2.4.5, 3.1.6, and 4.1.3, which normalize percent escapes once and preserve encoded percent signs. Users should upgrade to a patched version.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-24 16:16 UTC
CWE
  • CWE-174 - Double Decoding of the Same Data
  • CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
openjs CNA under the redhat root
CNA scorecard C 65/100 over 99 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
fast-uri fast-uri Affected: 2.4.1 , < 2.4.5 (semver)
Unaffected: 2.4.5 (semver)
Affected: 3.1.2 , < 3.1.6 (semver)
Unaffected: 3.1.6 (semver)
Affected: 4.0.0 , < 4.1.3 (semver)
Unaffected: 4.1.3 (semver)
guessed Create a notification for this product.
Credits
mcollina UlisesGascon NotAFlightRisk
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-75899",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-24T16:16:34.392088Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-24T16:19:58.701Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "packageURL": "pkg:npm/fast-uri",
          "product": "fast-uri",
          "vendor": "fast-uri",
          "versions": [
            {
              "lessThan": "2.4.5",
              "status": "affected",
              "version": "2.4.1",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "2.4.5",
              "versionType": "semver"
            },
            {
              "lessThan": "3.1.6",
              "status": "affected",
              "version": "3.1.2",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "3.1.6",
              "versionType": "semver"
            },
            {
              "lessThan": "4.1.3",
              "status": "affected",
              "version": "4.0.0",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "4.1.3",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "mcollina"
        },
        {
          "lang": "en",
          "type": "remediation reviewer",
          "value": "UlisesGascon"
        },
        {
          "lang": "en",
          "type": "reporter",
          "value": "NotAFlightRisk"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "fast-uri is a URI parser for Node.js. It decodes percent escapes in a hostname during parsing and then decodes the parsed hostname a second time during authority recomposition, so a single call to normalize or resolve can turn nested percent-encoded input into a different network destination such as a loopback hostname or address. For example, a doubly encoded host that spells out a loopback name decodes to that live host in one operation, which contradicts RFC 3986 section 2.4 that an implementation must not decode the same string more than once. An application that normalizes or resolves an untrusted HTTP-family URI before outbound routing, redirect validation, or a host-policy check can receive a destination different from the one the original encoded host represented, giving a server-side request forgery and host-policy bypass primitive. This is an incomplete-fix variant of CVE-2026-6322. The affected versions are 2.4.1 up to but not including 2.4.5, 3.1.2 up to but not including 3.1.6, and 4.0.0 up to but not including 4.1.3. The issue is fixed in 2.4.5, 3.1.6, and 4.1.3, which normalize percent escapes once and preserve encoded percent signs. Users should upgrade to a patched version."
            }
          ],
          "value": "fast-uri is a URI parser for Node.js. It decodes percent escapes in a hostname during parsing and then decodes the parsed hostname a second time during authority recomposition, so a single call to normalize or resolve can turn nested percent-encoded input into a different network destination such as a loopback hostname or address. For example, a doubly encoded host that spells out a loopback name decodes to that live host in one operation, which contradicts RFC 3986 section 2.4 that an implementation must not decode the same string more than once. An application that normalizes or resolves an untrusted HTTP-family URI before outbound routing, redirect validation, or a host-policy check can receive a destination different from the one the original encoded host represented, giving a server-side request forgery and host-policy bypass primitive. This is an incomplete-fix variant of CVE-2026-6322. The affected versions are 2.4.1 up to but not including 2.4.5, 3.1.2 up to but not including 3.1.6, and 4.0.0 up to but not including 4.1.3. The issue is fixed in 2.4.5, 3.1.6, and 4.1.3, which normalize percent escapes once and preserve encoded percent signs. Users should upgrade to a patched version."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-174",
              "description": "CWE-174: Double Decoding of the Same Data",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-918",
              "description": "CWE-918: Server-Side Request Forgery (SSRF)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-24T09:40:19.801Z",
        "orgId": "ce714d77-add3-4f53-aff5-83d477b104bb",
        "shortName": "openjs"
      },
      "references": [
        {
          "url": "https://github.com/fastify/fast-uri/security/advisories/GHSA-fph4-wmhf-6fwf"
        },
        {
          "url": "https://cna.openjsf.org/security-advisories.html"
        }
      ],
      "title": "fast-uri vulnerable to server-side request forgery via repeated hostname percent-decoding",
      "x_generator": {
        "engine": "cve-kit 1.0.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "ce714d77-add3-4f53-aff5-83d477b104bb",
    "assignerShortName": "openjs",
    "cveId": "CVE-2026-75899",
    "datePublished": "2026-08-24T09:40:19.801Z",
    "dateReserved": "2026-08-18T14:27:47.424Z",
    "dateUpdated": "2026-08-24T16:19:58.701Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-75899",
      "date": "2026-10-14",
      "epss": "0.0022",
      "percentile": "0.11621"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "packageURL": "pkg:npm/fast-uri",
                "product": "fast-uri",
                "vendor": "fast-uri",
                "versions": [
                  {
                    "lessThan": "2.4.5",
                    "status": "affected",
                    "version": "2.4.1",
                    "versionType": "semver"
                  },
                  {
                    "status": "unaffected",
                    "version": "2.4.5",
                    "versionType": "semver"
                  },
                  {
                    "lessThan": "3.1.6",
                    "status": "affected",
                    "version": "3.1.2",
                    "versionType": "semver"
                  },
                  {
                    "status": "unaffected",
                    "version": "3.1.6",
                    "versionType": "semver"
                  },
                  {
                    "lessThan": "4.1.3",
                    "status": "affected",
                    "version": "4.0.0",
                    "versionType": "semver"
                  },
                  {
                    "status": "unaffected",
                    "version": "4.1.3",
                    "versionType": "semver"
                  }
                ]
              }
            ],
            "source": "ce714d77-add3-4f53-aff5-83d477b104bb"
          }
        ],
        "configurations": [
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:a:openjsf:fast-uri:*:*:*:*:*:node.js:*:*",
                    "matchCriteriaId": "1EDB4E92-09B0-4B21-9FFE-FE199789F86F",
                    "versionEndExcluding": "2.4.5",
                    "versionStartIncluding": "2.4.1",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:a:openjsf:fast-uri:*:*:*:*:*:node.js:*:*",
                    "matchCriteriaId": "FE262744-646F-4399-8B26-11C21B3954D5",
                    "versionEndExcluding": "3.1.6",
                    "versionStartIncluding": "3.1.2",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:a:openjsf:fast-uri:*:*:*:*:*:node.js:*:*",
                    "matchCriteriaId": "E5821EBB-01F8-44C6-8EFF-BA388AB307D5",
                    "versionEndExcluding": "4.1.3",
                    "versionStartIncluding": "4.0.0",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "fast-uri is a URI parser for Node.js. It decodes percent escapes in a hostname during parsing and then decodes the parsed hostname a second time during authority recomposition, so a single call to normalize or resolve can turn nested percent-encoded input into a different network destination such as a loopback hostname or address. For example, a doubly encoded host that spells out a loopback name decodes to that live host in one operation, which contradicts RFC 3986 section 2.4 that an implementation must not decode the same string more than once. An application that normalizes or resolves an untrusted HTTP-family URI before outbound routing, redirect validation, or a host-policy check can receive a destination different from the one the original encoded host represented, giving a server-side request forgery and host-policy bypass primitive. This is an incomplete-fix variant of CVE-2026-6322. The affected versions are 2.4.1 up to but not including 2.4.5, 3.1.2 up to but not including 3.1.6, and 4.0.0 up to but not including 4.1.3. The issue is fixed in 2.4.5, 3.1.6, and 4.1.3, which normalize percent escapes once and preserve encoded percent signs. Users should upgrade to a patched version."
          },
          {
            "lang": "es",
            "value": "fast-uri es un analizador de URI para Node.js. Decodifica los escapes de porcentaje en un nombre de host durante el an\u00e1lisis y luego decodifica el nombre de host analizado una segunda vez durante la recomposici\u00f3n de la autoridad, por lo que una \u00fanica llamada a normalizar o resolver puede convertir una entrada anidada codificada por porcentaje en un destino de red diferente, como un nombre de host o una direcci\u00f3n de bucle invertido. Por ejemplo, un host doblemente codificado que deletrea un nombre de bucle invertido se decodifica a ese host activo en una sola operaci\u00f3n, lo que contradice la secci\u00f3n 2.4 de la RFC 3986 que establece que una implementaci\u00f3n no debe decodificar la misma cadena m\u00e1s de una vez. Una aplicaci\u00f3n que normaliza o resuelve un URI de la familia HTTP no confiable antes del enrutamiento saliente, la validaci\u00f3n de redirecci\u00f3n o una comprobaci\u00f3n de pol\u00edtica de host puede recibir un destino diferente al que representaba el host codificado original, lo que da lugar a una falsificaci\u00f3n de petici\u00f3n del lado del servidor y una primitiva de omisi\u00f3n de pol\u00edtica de host. Esta es una variante de correcci\u00f3n incompleta de CVE-2026-6322. Las versiones afectadas son 2.4.1 hasta, pero sin incluir, 2.4.5, 3.1.2 hasta, pero sin incluir, 3.1.6, y 4.0.0 hasta, pero sin incluir, 4.1.3. El problema est\u00e1 solucionado en 2.4.5, 3.1.6 y 4.1.3, que normalizan los escapes de porcentaje una vez y preservan los signos de porcentaje codificados. Los usuarios deben actualizar a una versi\u00f3n parcheada."
          }
        ],
        "id": "CVE-2026-75899",
        "lastModified": "2026-10-14T13:10:00.187",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "NONE",
                "baseScore": 7.5,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "NONE",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
                "version": "3.1"
              },
              "exploitabilityScore": 3.9,
              "impactScore": 3.6,
              "source": "ce714d77-add3-4f53-aff5-83d477b104bb",
              "type": "Secondary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2026-75899",
                "options": [
                  {
                    "exploitation": "none"
                  },
                  {
                    "automatable": "yes"
                  },
                  {
                    "technicalImpact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-24T16:16:34.392088Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2026-08-24T10:16:39.960",
        "references": [
          {
            "source": "ce714d77-add3-4f53-aff5-83d477b104bb",
            "tags": [
              "Vendor Advisory"
            ],
            "url": "https://cna.openjsf.org/security-advisories.html"
          },
          {
            "source": "ce714d77-add3-4f53-aff5-83d477b104bb",
            "tags": [
              "Mitigation",
              "Vendor Advisory"
            ],
            "url": "https://github.com/fastify/fast-uri/security/advisories/GHSA-fph4-wmhf-6fwf"
          }
        ],
        "sourceIdentifier": "ce714d77-add3-4f53-aff5-83d477b104bb",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-174"
              },
              {
                "lang": "en",
                "value": "CWE-918"
              }
            ],
            "source": "ce714d77-add3-4f53-aff5-83d477b104bb",
            "type": "Secondary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-10-14T07:15:15+00:00",
      "cve": "CVE-2026-75899",
      "id": "CVE-2026-75899",
      "initial_release_date": "2026-08-24T09:40:19.801000+00:00",
      "product_status:fixed": "118",
      "product_status:known_affected": "47",
      "product_status:known_not_affected": "1738",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "fast-uri: fast-uri: Server-Side Request Forgery via repeated hostname percent-decoding",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-75899.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-75899",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "yes"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-08-24T16:16:34.392088Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-08-24T16:17:14.102Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "packageURL": "pkg:npm/fast-uri",
              "product": "fast-uri",
              "vendor": "fast-uri",
              "versions": [
                {
                  "lessThan": "2.4.5",
                  "status": "affected",
                  "version": "2.4.1",
                  "versionType": "semver"
                },
                {
                  "status": "unaffected",
                  "version": "2.4.5",
                  "versionType": "semver"
                },
                {
                  "lessThan": "3.1.6",
                  "status": "affected",
                  "version": "3.1.2",
                  "versionType": "semver"
                },
                {
                  "status": "unaffected",
                  "version": "3.1.6",
                  "versionType": "semver"
                },
                {
                  "lessThan": "4.1.3",
                  "status": "affected",
                  "version": "4.0.0",
                  "versionType": "semver"
                },
                {
                  "status": "unaffected",
                  "version": "4.1.3",
                  "versionType": "semver"
                }
              ]
            }
          ],
          "credits": [
            {
              "lang": "en",
              "type": "remediation developer",
              "value": "mcollina"
            },
            {
              "lang": "en",
              "type": "remediation reviewer",
              "value": "UlisesGascon"
            },
            {
              "lang": "en",
              "type": "reporter",
              "value": "NotAFlightRisk"
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "supportingMedia": [
                {
                  "base64": false,
                  "type": "text/html",
                  "value": "fast-uri is a URI parser for Node.js. It decodes percent escapes in a hostname during parsing and then decodes the parsed hostname a second time during authority recomposition, so a single call to normalize or resolve can turn nested percent-encoded input into a different network destination such as a loopback hostname or address. For example, a doubly encoded host that spells out a loopback name decodes to that live host in one operation, which contradicts RFC 3986 section 2.4 that an implementation must not decode the same string more than once. An application that normalizes or resolves an untrusted HTTP-family URI before outbound routing, redirect validation, or a host-policy check can receive a destination different from the one the original encoded host represented, giving a server-side request forgery and host-policy bypass primitive. This is an incomplete-fix variant of CVE-2026-6322. The affected versions are 2.4.1 up to but not including 2.4.5, 3.1.2 up to but not including 3.1.6, and 4.0.0 up to but not including 4.1.3. The issue is fixed in 2.4.5, 3.1.6, and 4.1.3, which normalize percent escapes once and preserve encoded percent signs. Users should upgrade to a patched version."
                }
              ],
              "value": "fast-uri is a URI parser for Node.js. It decodes percent escapes in a hostname during parsing and then decodes the parsed hostname a second time during authority recomposition, so a single call to normalize or resolve can turn nested percent-encoded input into a different network destination such as a loopback hostname or address. For example, a doubly encoded host that spells out a loopback name decodes to that live host in one operation, which contradicts RFC 3986 section 2.4 that an implementation must not decode the same string more than once. An application that normalizes or resolves an untrusted HTTP-family URI before outbound routing, redirect validation, or a host-policy check can receive a destination different from the one the original encoded host represented, giving a server-side request forgery and host-policy bypass primitive. This is an incomplete-fix variant of CVE-2026-6322. The affected versions are 2.4.1 up to but not including 2.4.5, 3.1.2 up to but not including 3.1.6, and 4.0.0 up to but not including 4.1.3. The issue is fixed in 2.4.5, 3.1.6, and 4.1.3, which normalize percent escapes once and preserve encoded percent signs. Users should upgrade to a patched version."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 7.5,
                "baseSeverity": "HIGH",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
                "version": "3.1"
              },
              "format": "CVSS",
              "scenarios": [
                {
                  "lang": "en",
                  "value": "GENERAL"
                }
              ]
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-174",
                  "description": "CWE-174: Double Decoding of the Same Data",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            },
            {
              "descriptions": [
                {
                  "cweId": "CWE-918",
                  "description": "CWE-918: Server-Side Request Forgery (SSRF)",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-24T09:40:19.801Z",
            "orgId": "ce714d77-add3-4f53-aff5-83d477b104bb",
            "shortName": "openjs"
          },
          "references": [
            {
              "url": "https://github.com/fastify/fast-uri/security/advisories/GHSA-fph4-wmhf-6fwf"
            },
            {
              "url": "https://cna.openjsf.org/security-advisories.html"
            }
          ],
          "title": "fast-uri vulnerable to server-side request forgery via repeated hostname percent-decoding",
          "x_generator": {
            "engine": "cve-kit 1.0.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "ce714d77-add3-4f53-aff5-83d477b104bb",
        "assignerShortName": "openjs",
        "cveId": "CVE-2026-75899",
        "datePublished": "2026-08-24T09:40:19.801Z",
        "dateReserved": "2026-08-18T14:27:47.424Z",
        "dateUpdated": "2026-08-24T16:19:58.701Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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

JSON

Loading timeline…




    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.