UnratedFix available

DEBIAN-CVE-2026-16221

Type: advisorySource: OSV1 source record

Impact: fast-uri versions from 2.3.1 through 4.1.0 (including the 3.x line up to 3.1.3 and the 2.x line up to 2.4.2) do not treat a literal backslash character (U+005C) as an authority delimiter. Node's native WHATWG URL parser, used by fetch, undici, and Node's http and https clients, normalizes the backslash to a forward slash for special schemes such as http, https, ws, wss, ftp, and file. As a result, the two parsers extract different hosts from the same input string. Applications that use fast-uri to enforce host-based policy such as allowlists, denylists, loopback or SSRF filtering, redirect validation, or outbound proxy routing before passing the same URL into Node's URL or fetch consumers can be steered to an unintended destination, including cloud metadata endpoints, loopback, or internal hosts. Patches: upgrade to fast-uri 4.1.1, 3.1.4, or 2.4.3. Workarounds: none.

Announced 19 Jul 2026Group revision 1

Original source ↗

DEBIAN-CVE-2026-16221

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:DEBIAN-CVE-2026-16221

node-ajv

Source reference: /affected/0/package/name

Affected versions: 8.12.0~ds+~2.1.1-5
Source reference: /affected/0/versions
8.17.1~ds+~3.0.1+~3.1.0-1
Source reference: /affected/0/versions
8.17.1~ds+~3.0.1+~3.1.0-2
Source reference: /affected/0/versions
8.17.1~ds+~3.0.1+~3.1.0-3
Source reference: /affected/0/versions
8.17.1~ds+~3.0.1+~3.1.0-4
Source reference: /affected/0/versions
8.18.0~ds+~cs6.1.1-1
Source reference: /affected/0/versions
8.18.0~ds+~cs6.1.1-2
Source reference: /affected/0/versions
8.20.0~ds+~cs6.1.3-1
Source reference: /affected/0/versions
8.20.0~ds+~cs7.1.2-1
Source reference: /affected/0/versions
8.20.0~ds+~cs7.1.3-1
Source reference: /affected/0/versions
8.20.0~ds+~cs7.1.3-2
Source reference: /affected/0/versions
8.20.0~ds+~cs7.1.3-3
Source reference: /affected/0/versions
8.20.0~ds+~cs7.1.4-1
Source reference: /affected/0/versions
8.20.0~ds+~cs7.1.5-1
Source reference: /affected/0/versions
8.20.0~ds+~cs7.1.6-1
Source reference: /affected/0/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

node-ajv

Source reference: /affected/1/package/name

Affected versions: 8.12.0~ds+~2.1.1-5
Source reference: /affected/1/versions
8.17.1~ds+~3.0.1+~3.1.0-1
Source reference: /affected/1/versions
8.17.1~ds+~3.0.1+~3.1.0-2
Source reference: /affected/1/versions
8.17.1~ds+~3.0.1+~3.1.0-3
Source reference: /affected/1/versions
8.17.1~ds+~3.0.1+~3.1.0-4
Source reference: /affected/1/versions
8.18.0~ds+~cs6.1.1-1
Source reference: /affected/1/versions
8.18.0~ds+~cs6.1.1-2
Source reference: /affected/1/versions
8.20.0~ds+~cs6.1.3-1
Source reference: /affected/1/versions
Fixed versions: 8.20.0~ds+~cs7.1.2-1
Source reference: /affected/1/ranges
Prerequisites: Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "node-ajv",
      "purl": "pkg:deb/debian/node-ajv?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "8.12.0~ds+~2.1.1-5",
      "8.17.1~ds+~3.0.1+~3.1.0-1",
      "8.17.1~ds+~3.0.1+~3.1.0-2",
      "8.17.1~ds+~3.0.1+~3.1.0-3",
      "8.17.1~ds+~3.0.1+~3.1.0-4",
      "8.18.0~ds+~cs6.1.1-1",
      "8.18.0~ds+~cs6.1.1-2",
      "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+~cs7.1.3-2",
      "8.20.0~ds+~cs7.1.3-3",
      "8.20.0~ds+~cs7.1.4-1",
      "8.20.0~ds+~cs7.1.5-1",
      "8.20.0~ds+~cs7.1.6-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-16221.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "8.20.0~ds+~cs7.1.2-1"
          }
        ]
      }
    ],
    "package": {
      "name": "node-ajv",
      "purl": "pkg:deb/debian/node-ajv?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "8.12.0~ds+~2.1.1-5",
      "8.17.1~ds+~3.0.1+~3.1.0-1",
      "8.17.1~ds+~3.0.1+~3.1.0-2",
      "8.17.1~ds+~3.0.1+~3.1.0-3",
      "8.17.1~ds+~3.0.1+~3.1.0-4",
      "8.18.0~ds+~cs6.1.1-1",
      "8.18.0~ds+~cs6.1.1-2",
      "8.20.0~ds+~cs6.1.3-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-16221.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event: #55547 · Revision 1
Added to Heist Feed: Sun, 25 Oct 2026 16:06:20 GMT
Publisher date: Sun, 19 Jul 2026 15:16:49 GMT

Read the original announcement

Revision history

25 Oct 2026DEBIAN-CVE-2026-16221 · Revision 1Source updated