Skip to content
Heist/ feed
Back to feed
High

fast-uri vulnerable to host confusion via percent-encoded authority delimiters

Type: advisorySources: OSV

fast-uri normalize() decoded percent-encoded authority delimiters inside the host component and then re-emitted them as raw delimiters during serialization. A host that combined an allowed domain, an encoded at-sign, and a different domain was re-emitted with the at-sign as a raw userinfo separator, changing the URI's authority to the second domain. Applications that normalize untrusted URLs before host allowlist checks, redirect validation, or outbound request routing can be steered to a different authority than the input appeared to specify. Versions <= 3.1.1 are affected. Update to 3.1.2 or later.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-6322
Confirmed fixed CVEs
Not specified
Updated in this feed
5 Nov 2026, 03:51 UTC · Revision 1

Source evidence

fast-uri vulnerable to host confusion via percent-encoded authority delimiters

core-osv · Original source

Published 5 May 2026, 10:29 UTC

fast-uri normalize() decoded percent-encoded authority delimiters inside the host component and then re-emitted them as raw delimiters during serialization. A host that combined an allowed domain, an encoded at-sign, and a different domain was re-emitted with the at-sign as a raw userinfo separator, changing the URI's authority to the second domain. Applications that normalize untrusted URLs before host allowlist checks, redirect validation, or outbound request routing can be steered to a different authority than the input appeared to specify. Versions <= 3.1.1 are affected. Update to 3.1.2 or later.

osv:CVE-2026-6322
Complete source record
{
  "id": "7a99c647b2dda64465255d6cbc4749e5dcfc79a925ae4353b077235b15b73382",
  "url": "https://osv.dev/vulnerability/CVE-2026-6322",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "fast-uri vulnerable to host confusion via percent-encoded authority delimiters",
    "summary": "fast-uri normalize() decoded percent-encoded authority delimiters inside the host component and then re-emitted them as raw delimiters during serialization. A host that combined an allowed domain, an encoded at-sign, and a different domain was re-emitted with the at-sign as a raw userinfo separator, changing the URI's authority to the second domain. Applications that normalize untrusted URLs before host allowlist checks, redirect validation, or outbound request routing can be steered to a different authority than the input appeared to specify. Versions <= 3.1.1 are affected. Update to 3.1.2 or later.",
    "evidence": "osv:CVE-2026-6322",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-6322",
      "aliases": [
        "CVE-2026-6322",
        "GHSA-v39h-62p7-jpjc"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/fastify/fast-uri",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "919dd8ea7689fcc220d0d9b71307f5095e723ef9"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "3.1.2"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "cpe": "cpe:2.3:a:openjsf:fast-uri:*:*:*:*:*:node.js:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "3.1.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v3.1.1",
            "v3.1.0",
            "v3.0.6",
            "v3.0.5",
            "v3.0.4",
            "v3.0.3",
            "v3.0.2",
            "v3.0.1",
            "v3.0.0",
            "v2.4.0",
            "v2.3.1",
            "v2.3.0",
            "v2.2.0",
            "v2.1.0",
            "v2.0.0",
            "v1.0.1",
            "v1.0.0",
            "v0.0.2",
            "v0.0.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-6322.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:42.248542203Z",
      "provider": "osv",
      "references": [
        "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-6322.json",
        "https://access.redhat.com/errata/RHSA-2026:25271",
        "https://access.redhat.com/errata/RHSA-2026:25273",
        "https://access.redhat.com/errata/RHSA-2026:26225",
        "https://access.redhat.com/errata/RHSA-2026:26234",
        "https://access.redhat.com/errata/RHSA-2026:28571",
        "https://access.redhat.com/errata/RHSA-2026:29197",
        "https://access.redhat.com/errata/RHSA-2026:29795",
        "https://access.redhat.com/errata/RHSA-2026:29796",
        "https://access.redhat.com/errata/RHSA-2026:29800",
        "https://access.redhat.com/errata/RHSA-2026:29834",
        "https://access.redhat.com/errata/RHSA-2026:30076",
        "https://access.redhat.com/errata/RHSA-2026:33683",
        "https://access.redhat.com/errata/RHSA-2026:34160",
        "https://access.redhat.com/errata/RHSA-2026:34342",
        "https://access.redhat.com/errata/RHSA-2026:34374",
        "https://access.redhat.com/errata/RHSA-2026:34766",
        "https://access.redhat.com/errata/RHSA-2026:34770",
        "https://access.redhat.com/errata/RHSA-2026:36651",
        "https://access.redhat.com/errata/RHSA-2026:36754",
        "https://access.redhat.com/errata/RHSA-2026:37186",
        "https://access.redhat.com/errata/RHSA-2026:37385",
        "https://access.redhat.com/errata/RHSA-2026:37628",
        "https://access.redhat.com/errata/RHSA-2026:40118",
        "https://access.redhat.com/errata/RHSA-2026:40945",
        "https://access.redhat.com/errata/RHSA-2026:41066",
        "https://access.redhat.com/errata/RHSA-2026:41928",
        "https://access.redhat.com/errata/RHSA-2026:41951",
        "https://access.redhat.com/errata/RHSA-2026:42078",
        "https://access.redhat.com/errata/RHSA-2026:42142",
        "https://access.redhat.com/errata/RHSA-2026:43038",
        "https://access.redhat.com/errata/RHSA-2026:54395",
        "https://access.redhat.com/errata/RHSA-2026:54555",
        "https://access.redhat.com/errata/RHSA-2026:56366",
        "https://access.redhat.com/errata/RHSA-2026:56431",
        "https://access.redhat.com/errata/RHSA-2026:56928",
        "https://access.redhat.com/errata/RHSA-2026:56968",
        "https://access.redhat.com/errata/RHSA-2026:57013",
        "https://access.redhat.com/errata/RHSA-2026:57487",
        "https://access.redhat.com/errata/RHSA-2026:60520",
        "https://access.redhat.com/errata/RHSA-2026:60855",
        "https://access.redhat.com/errata/RHSA-2026:61783",
        "https://access.redhat.com/security/cve/CVE-2026-6322",
        "https://cna.openjsf.org/security-advisories.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/6xxx/CVE-2026-6322.json",
        "https://github.com/fastify/fast-uri/security/advisories/GHSA-v39h-62p7-jpjc",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-6322",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2466684"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-436"
        ],
        "cna_assigner": "openjs",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/6xxx/CVE-2026-6322.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-6322",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 509985,
  "published_at": "2026-05-05T10:29:16.378+00:00"
}