Vulnerability-Lookup

CVE-2026-110306 (GCVE-0-2026-110306)

Vulnerability from cvelistv5 – Published: 2026-10-20 07:03 – Updated: 2026-10-20 19:14

Title

fast-uri vulnerable to URI scheme spoofing via percent-encoded scheme decoding

Summary

fast-uri is a dependency-free RFC 3986 URI parser and serializer for Node.js. In versions before 2.4.8, from 3.0.0 through 3.1.8, and from 4.0.0 through 4.2.2, fast-uri percent-decodes the scheme component with the legacy global unescape() function before validating it, so an input whose decoded scheme is a dangerous token is emitted as a live scheme even though RFC 3986 does not allow percent-encoding in a scheme and no other parser accepts it. An application that screens dangerous schemes on the raw input and then stores or renders the normalized or resolved result can turn an inert string into an executable javascript, data, or vbscript URL, producing a stored or reflected cross-site scripting vector, and the equal() comparison treats an encoded and a plain scheme as the same, which can bypass equality-based allowlists. The issue is fixed in fast-uri 2.4.8, 3.1.9, and 4.2.3, and users should upgrade to one of these versions or later. As a workaround, reject input whose scheme part contains a percent sign, or check the parsed scheme against an allowlist after normalization and use that same parsed result rather than the raw string.

Severity

6.1 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-20 19:14 UTC

CWE

CWE-172 - Encoding Error
CWE-180 - Incorrect Behavior Order: Validate Before Canonicalize

Assigner

openjs CNA under the redhat root

CNA scorecard C 65/100 over 125 records in the last 180 days details

References

2 references

URL	Tags
https://github.com/fastify/fast-uri/security/advi…
https://cna.openjsf.org/security-advisories.html

Impacted products

1 product

Vendor	Product	Version	CPE status
fast-uri	fast-uri	Affected: 0 , < 2.4.8 (semver) Unaffected: 2.4.8 (semver) Affected: 3.0.0 , < 3.1.9 (semver) Unaffected: 3.1.9 (semver) Affected: 4.0.0 , < 4.2.3 (semver) Unaffected: 4.2.3 (semver)	guessed

Credits

UlisesGascon mcollina zekth

Show details on NVD website

JSON

To clipboard

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CLEANSTART-2026-WP68198 (CVE-2026-110306)

Vulnerability from cleanstart – Published: 2026-10-31 00:40 – Updated: 2026-10-30 08:33 – Source website

Summary

fast-uri is a dependency-free RFC 3986 URI parser and serializer for Node

Details

Security vulnerability affects the langfuse package. fast-uri is a dependency-free RFC 3986 URI parser and serializer for Node.

Severity

6.1 (Medium)


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

References

URL

Type

	https://github.com/cleanstart-dev/cleanstart-secu…	ADVISORY
	https://osv.dev/vulnerability/CVE-2026-110306	WEB
	https://nvd.nist.gov/vuln/detail/CVE-2026-110306	WEB

JSON

To clipboard

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  "affected": [
    {
      "package": {
        "ecosystem": "CleanStart",
        "name": "langfuse",
        "purl": "pkg:apk/cleanstart/langfuse"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.225.9-r9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "credits": [],
  "database_specific": {},
  "details": "Security vulnerability affects the langfuse package. fast-uri is a dependency-free RFC 3986 URI parser and serializer for Node.",
  "id": "CLEANSTART-2026-WP68198",
  "modified": "2026-10-30T08:33:10Z",
  "published": "2026-10-31T00:40:47.165331Z",
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    },
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      "type": "WEB",
      "url": "https://osv.dev/vulnerability/CVE-2026-110306"
    },
    {
      "type": "WEB",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-110306"
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  "related": [],
  "schema_version": "1.7.3",
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    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "fast-uri is a dependency-free RFC 3986 URI parser and serializer for Node",
  "upstream": [
    "CVE-2026-110306"
  ]
}

FKIE_CVE-2026-110306

Vulnerability from fkie_nvd - Published: 2026-10-20 07:17 - Updated: 2026-10-20 20:17

Severity

6.1 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Summary

References

	URL	Tags
	ce714d77-add3-4f53-aff5-83d477b104bb	https://cna.openjsf.org/security-advisories.html
	ce714d77-add3-4f53-aff5-83d477b104bb	https://github.com/fastify/fast-uri/security/advisories/GHSA-w74x-v6f9-j3xg

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "packageURL": "pkg:npm/fast-uri",
          "product": "fast-uri",
          "vendor": "fast-uri",
          "versions": [
            {
              "lessThan": "2.4.8",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "2.4.8",
              "versionType": "semver"
            },
            {
              "lessThan": "3.1.9",
              "status": "affected",
              "version": "3.0.0",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "3.1.9",
              "versionType": "semver"
            },
            {
              "lessThan": "4.2.3",
              "status": "affected",
              "version": "4.0.0",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "4.2.3",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "ce714d77-add3-4f53-aff5-83d477b104bb"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "fast-uri is a dependency-free RFC 3986 URI parser and serializer for Node.js. In versions before 2.4.8, from 3.0.0 through 3.1.8, and from 4.0.0 through 4.2.2, fast-uri percent-decodes the scheme component with the legacy global unescape() function before validating it, so an input whose decoded scheme is a dangerous token is emitted as a live scheme even though RFC 3986 does not allow percent-encoding in a scheme and no other parser accepts it. An application that screens dangerous schemes on the raw input and then stores or renders the normalized or resolved result can turn an inert string into an executable javascript, data, or vbscript URL, producing a stored or reflected cross-site scripting vector, and the equal() comparison treats an encoded and a plain scheme as the same, which can bypass equality-based allowlists. The issue is fixed in fast-uri 2.4.8, 3.1.9, and 4.2.3, and users should upgrade to one of these versions or later. As a workaround, reject input whose scheme part contains a percent sign, or check the parsed scheme against an allowlist after normalization and use that same parsed result rather than the raw string."
    }
  ],
  "id": "CVE-2026-110306",
  "lastModified": "2026-10-20T20:17:14.917",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.1,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 2.7,
        "source": "ce714d77-add3-4f53-aff5-83d477b104bb",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-110306",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-10-20T19:14:03.847725Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-10-20T07:17:08.810",
  "references": [
    {
      "source": "ce714d77-add3-4f53-aff5-83d477b104bb",
      "url": "https://cna.openjsf.org/security-advisories.html"
    },
    {
      "source": "ce714d77-add3-4f53-aff5-83d477b104bb",
      "url": "https://github.com/fastify/fast-uri/security/advisories/GHSA-w74x-v6f9-j3xg"
    }
  ],
  "sourceIdentifier": "ce714d77-add3-4f53-aff5-83d477b104bb",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-172"
        },
        {
          "lang": "en",
          "value": "CWE-180"
        }
      ],
      "source": "ce714d77-add3-4f53-aff5-83d477b104bb",
      "type": "Secondary"
    }
  ]
}

GHSA-W74X-V6F9-J3XG

Vulnerability from github – Published: 2026-10-23 21:41 – Updated: 2026-10-23 21:41

Summary

fast-uri vulnerable to URI scheme spoofing via percent-encoded scheme decoding

Details

Impact

fast-uri percent-decodes the scheme component with the legacy global unescape() before validating it, so an input whose decoded scheme is a valid but dangerous token is emitted as a live scheme. RFC 3986 section 3.1 does not allow percent-encoding in a scheme, so no RFC or WHATWG parser treats such input as having that scheme, but fast-uri does.

For example, normalize('%6Aavascript:alert(1)') returns javascript:alert(1), resolve('https://a.example/', '%6Aavascript:alert(1)') returns javascript:alert(1), and parse('%6Aavascript:alert(1)').scheme returns javascript. The %uXXXX form (%u006Aavascript:) produces the same result, and equal('%68ttp://a/', 'http://a/') returns true.

An application that screens dangerous schemes on the raw input and then stores or renders normalize(input) or resolve(base, input) turns an inert string into an executable javascript:, data:, or vbscript: URL, a stored or reflected cross-site scripting vector in the consuming application. equal() also treats an encoded and a plain scheme as the same, which can bypass equality-based allowlists.

Patches

Upgrade to fast-uri 2.4.8, 3.1.9, or 4.2.3.

Workarounds

Reject input whose scheme part (before the first :, and before any /, ?, or #) contains %. Alternatively, check parse(x).scheme against an allowlist after normalization and use that same parsed result rather than the raw string.

Severity

6.1 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "fast-uri"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.4.8"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "fast-uri"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.0.0"
            },
            {
              "fixed": "3.1.9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "fast-uri"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.0.0"
            },
            {
              "fixed": "4.2.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-110306"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-172",
      "CWE-180"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-23T21:41:36Z",
    "nvd_published_at": "2026-10-20T07:17:08Z",
    "severity": "MODERATE"
  },
  "details": "### Impact\n\n`fast-uri` percent-decodes the scheme component with the legacy global `unescape()` before validating it, so an input whose decoded scheme is a valid but dangerous token is emitted as a live scheme. RFC 3986 section 3.1 does not allow percent-encoding in a scheme, so no RFC or WHATWG parser treats such input as having that scheme, but `fast-uri` does.\n\nFor example, `normalize(\u0027%6Aavascript:alert(1)\u0027)` returns `javascript:alert(1)`, `resolve(\u0027https://a.example/\u0027, \u0027%6Aavascript:alert(1)\u0027)` returns `javascript:alert(1)`, and `parse(\u0027%6Aavascript:alert(1)\u0027).scheme` returns `javascript`. The `%uXXXX` form (`%u006Aavascript:`) produces the same result, and `equal(\u0027%68ttp://a/\u0027, \u0027http://a/\u0027)` returns `true`.\n\nAn application that screens dangerous schemes on the raw input and then stores or renders `normalize(input)` or `resolve(base, input)` turns an inert string into an executable `javascript:`, `data:`, or `vbscript:` URL, a stored or reflected cross-site scripting vector in the consuming application. `equal()` also treats an encoded and a plain scheme as the same, which can bypass equality-based allowlists.\n\n### Patches\n\nUpgrade to `fast-uri` `2.4.8`, `3.1.9`, or `4.2.3`.\n\n### Workarounds\n\nReject input whose scheme part (before the first `:`, and before any `/`, `?`, or `#`) contains `%`. Alternatively, check `parse(x).scheme` against an allowlist after normalization and use that same parsed result rather than the raw string.",
  "id": "GHSA-w74x-v6f9-j3xg",
  "modified": "2026-10-23T21:41:36Z",
  "published": "2026-10-23T21:41:36Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/fastify/fast-uri/security/advisories/GHSA-w74x-v6f9-j3xg"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-110306"
    },
    {
      "type": "WEB",
      "url": "https://github.com/fastify/fast-uri/commit/39933a1f1422986f14e2d844f552238feb40f5d4"
    },
    {
      "type": "WEB",
      "url": "https://github.com/fastify/fast-uri/commit/597f254c86d151568511eeb9a1df761fd12520b3"
    },
    {
      "type": "WEB",
      "url": "https://github.com/fastify/fast-uri/commit/e60e716f41d1d73717e2d803d20b68d2c6d20a0f"
    },
    {
      "type": "WEB",
      "url": "https://cna.openjsf.org/security-advisories.html"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/fastify/fast-uri"
    },
    {
      "type": "WEB",
      "url": "https://github.com/fastify/fast-uri/releases/tag/v2.4.8"
    },
    {
      "type": "WEB",
      "url": "https://github.com/fastify/fast-uri/releases/tag/v3.1.9"
    },
    {
      "type": "WEB",
      "url": "https://github.com/fastify/fast-uri/releases/tag/v4.2.3"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "fast-uri vulnerable to URI scheme spoofing via percent-encoded scheme decoding"
}

OPENSUSE-SU-2026:12261-1

Vulnerability from csaf_opensuse - Published: 2026-10-24 00:00 - Updated: 2026-10-26 10:35

Summary

git-bug-0.11.0-3.1 on GA media

Severity

Moderate

Scope

13 vulnerabilities in this advisory, including CVE-2026-110306.

CVE-2026-110306

6.1 (Medium)


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

Recommended: 16 products

Open the full advisory

RHSA-2026:90388

Vulnerability from csaf_redhat - Published: 2026-10-26 17:44 - Updated: 2026-11-02 16:24

Summary

Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update

Severity

Important

Scope

10 vulnerabilities in this advisory, including CVE-2026-110306.

CVE-2026-110306

A flaw was found in fast-uri. The library incorrectly decodes percent-encoded characters in protocol schemes prior to validation, causing invalid or prohibited schemes to be accepted as valid. A remote attacker can exploit this vulnerability by submitting a specially crafted Uniform Resource Identifier (URI) to bypass application allowlists, potentially leading to Cross-Site Scripting (XSS) if the normalized output is rendered in a web browser.

6.1 (Medium)


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

Fixed: 3 products

https://access.redhat.com/errata/RHSA-2026:90388

Open the full advisory

RHSA-2026:90990

Vulnerability from csaf_redhat - Published: 2026-10-27 16:15 - Updated: 2026-11-01 05:18

Summary

Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update

Severity

Important

Scope

6 vulnerabilities in this advisory, including CVE-2026-110306.

CVE-2026-110306

6.1 (Medium)


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

Fixed: 4 products

https://access.redhat.com/errata/RHSA-2026:90990

Open the full advisory

RHSA-2026:91181

Vulnerability from csaf_redhat - Published: 2026-10-27 18:14 - Updated: 2026-11-03 19:31

Summary

Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update

Severity

Important

Scope

7 vulnerabilities in this advisory, including CVE-2026-110306.

CVE-2026-110306

6.1 (Medium)


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

Fixed: 4 products

https://access.redhat.com/errata/RHSA-2026:91181

Open the full advisory

RHSA-2026:91292

Vulnerability from csaf_redhat - Published: 2026-10-27 20:42 - Updated: 2026-11-03 19:31

Summary

Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update

Severity

Important

Scope

10 vulnerabilities in this advisory, including CVE-2026-110306.

CVE-2026-110306

6.1 (Medium)


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

Fixed: 3 products

https://access.redhat.com/errata/RHSA-2026:91292

Open the full advisory

UBUNTU-CVE-2026-110306 (CVE-2026-110306)

Vulnerability from osv_ubuntu – Published: 2026-10-20 07:17 – Updated: 2026-10-20 07:17 – Source website

Details

Severity

6.1 (Medium)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-110306	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-110306	REPORT
	https://github.com/fastify/fast-uri/security/advi…	REPORT
	https://cna.openjsf.org/security-advisories.html	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "node-ajv",
            "binary_version": "5.0.0-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "node-ajv",
        "purl": "pkg:deb/ubuntu/node-ajv@5.0.0-1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "5.0.0-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "node-ajv",
            "binary_version": "6.10.2-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "node-ajv",
        "purl": "pkg:deb/ubuntu/node-ajv@6.10.2-1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "6.10.2-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "node-ajv",
            "binary_version": "6.12.6-3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "node-ajv",
        "purl": "pkg:deb/ubuntu/node-ajv@6.12.6-3?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "6.12.6-2",
        "6.12.6-3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "node-ajv",
            "binary_version": "8.12.0~ds+~2.1.1-4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "node-ajv",
        "purl": "pkg:deb/ubuntu/node-ajv@8.12.0~ds+~2.1.1-4?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "6.12.6-3",
        "8.12.0~ds+~2.1.1-4"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "node-ajv",
            "binary_version": "8.20.0~ds+~cs7.1.3-3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.10",
        "name": "node-ajv",
        "purl": "pkg:deb/ubuntu/node-ajv@8.20.0~ds+~cs7.1.3-3?arch=source\u0026distro=stonking"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "8.17.1~ds+~3.0.1+~3.1.0-4build1",
        "8.20.0~ds+~cs6.1.3-1",
        "8.20.0~ds+~cs7.1.2-1",
        "8.20.0~ds+~cs7.1.3-1",
        "8.20.0~ds+~cs7.1.3-3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "node-ajv",
            "binary_version": "8.17.1~ds+~3.0.1+~3.1.0-4build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "node-ajv",
        "purl": "pkg:deb/ubuntu/node-ajv@8.17.1~ds+~3.0.1+~3.1.0-4build1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "8.12.0~ds+~2.1.1-5",
        "8.17.1~ds+~3.0.1+~3.1.0-2",
        "8.17.1~ds+~3.0.1+~3.1.0-4build1"
      ]
    }
  ],
  "aliases": [],
  "details": "fast-uri is a dependency-free RFC 3986 URI parser and serializer for Node.js. In versions before 2.4.8, from 3.0.0 through 3.1.8, and from 4.0.0 through 4.2.2, fast-uri percent-decodes the scheme component with the legacy global unescape() function before validating it, so an input whose decoded scheme is a dangerous token is emitted as a live scheme even though RFC 3986 does not allow percent-encoding in a scheme and no other parser accepts it. An application that screens dangerous schemes on the raw input and then stores or renders the normalized or resolved result can turn an inert string into an executable javascript, data, or vbscript URL, producing a stored or reflected cross-site scripting vector, and the equal() comparison treats an encoded and a plain scheme as the same, which can bypass equality-based allowlists. The issue is fixed in fast-uri 2.4.8, 3.1.9, and 4.2.3, and users should upgrade to one of these versions or later. As a workaround, reject input whose scheme part contains a percent sign, or check the parsed scheme against an allowlist after normalization and use that same parsed result rather than the raw string.",
  "id": "UBUNTU-CVE-2026-110306",
  "modified": "2026-10-20T07:17:00Z",
  "published": "2026-10-20T07:17:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-110306"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-110306"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/fastify/fast-uri/security/advisories/GHSA-w74x-v6f9-j3xg"
    },
    {
      "type": "REPORT",
      "url": "https://cna.openjsf.org/security-advisories.html"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-110306"
  ]
}

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

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

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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-2026-110306 (GCVE-0-2026-110306)

CLEANSTART-2026-WP68198 (CVE-2026-110306)

FKIE_CVE-2026-110306

GHSA-W74X-V6F9-J3XG

Impact

Patches

Workarounds

OPENSUSE-SU-2026:12261-1

RHSA-2026:90388

RHSA-2026:90990

RHSA-2026:91181

RHSA-2026:91292

UBUNTU-CVE-2026-110306 (CVE-2026-110306)

Tags

Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour