UnratedFix available

DEBIAN-CVE-2026-86472

Type: advisorySource: OSV1 source record

fast-uri is a dependency-free RFC 3986 URI parser for Node.js, used by Fastify and ajv. In versions before 2.4.7, from 3.0.0 through 3.1.7, and from 4.0.0 through 4.1.4, fast-uri folds the host to lowercase before it percent-decodes the host, so a percent-encoded uppercase octet such as %41 decodes to a literal A that is never folded. For a scheme-relative reference such as //host there is no scheme, so the host canonicalization that would normally repair this does not run, and parse, normalize, and equal then disagree on the same host. An application that makes a case-sensitive host decision on fast-uri output, for example a host allowlist or denylist that compares the parsed host or uses equal, can be steered past the check with a percent-encoded uppercase octet, and because hostnames are case-insensitive in DNS and HTTP the evading spelling still reaches the host the check meant to gate. The issue is fixed in fast-uri 2.4.7, 3.1.8, and 4.1.5, and users should upgrade to one of those versions or later. As a workaround, compare hosts case-insensitively by lowercasing the parsed host before any allowlist or denylist decision.

Announced 15 Sept 2026Group revision 1

Original source ↗

DEBIAN-CVE-2026-86472

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-2026-86472

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
8.20.0~ds+~cs7.1.2-1
Source reference: /affected/1/versions
8.20.0~ds+~cs7.1.3-1
Source reference: /affected/1/versions
8.20.0~ds+~cs7.1.3-2
Source reference: /affected/1/versions
8.20.0~ds+~cs7.1.3-3
Source reference: /affected/1/versions
8.20.0~ds+~cs7.1.4-1
Source reference: /affected/1/versions
8.20.0~ds+~cs7.1.5-1
Source reference: /affected/1/versions
Fixed versions: 8.20.0~ds+~cs7.1.6-1
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-2026-86472.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "8.20.0~ds+~cs7.1.6-1"
          }
        ]
      }
    ],
    "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",
      "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"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-86472.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event: #58220 · Revision 1
Added to Heist Feed: Sun, 25 Oct 2026 17:46:22 GMT
Publisher date: Tue, 15 Sep 2026 11:17:12 GMT

Read the original announcement

Revision history

25 Oct 2026DEBIAN-CVE-2026-86472 · Revision 1Source updated