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node-ajv — security advisory

Type: advisorySources: OSVAdvisory ID: DEBIAN-CVE-2026-75899

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.

Products
node-ajv
Affected 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, 8.20.0~ds+~cs7.1.6-2
Fixed versions
8.20.0~ds+~cs7.1.4-1
CVEs
CVE-2026-75899
Confirmed fixed CVEs
Not specified
Updated in this feed
30 Oct 2026, 17:32 UTC · Revision 1

Source evidence

DEBIAN-CVE-2026-75899

core-osv · Original source

Published 24 Aug 2026, 10:16 UTC

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.

osv:DEBIAN-CVE-2026-75899

node-ajv

Fixed versions: Not specified

node-ajv

Fixed versions: 8.20.0~ds+~cs7.1.4-1

Complete source record
{
  "id": "f501aef44303b045a76124c989b75d2a2ee23a9a2bc8e825c9a25e74b0f9d835",
  "url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-75899",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "DEBIAN-CVE-2026-75899",
    "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.",
    "evidence": "osv:DEBIAN-CVE-2026-75899",
    "products": [
      {
        "name": {
          "value": "node-ajv",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "8.12.0~ds+~2.1.1-5",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "8.17.1~ds+~3.0.1+~3.1.0-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "8.17.1~ds+~3.0.1+~3.1.0-2",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "8.17.1~ds+~3.0.1+~3.1.0-3",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "8.17.1~ds+~3.0.1+~3.1.0-4",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "8.18.0~ds+~cs6.1.1-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "8.18.0~ds+~cs6.1.1-2",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "8.20.0~ds+~cs6.1.3-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "8.20.0~ds+~cs7.1.2-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "8.20.0~ds+~cs7.1.3-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "8.20.0~ds+~cs7.1.3-2",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "8.20.0~ds+~cs7.1.3-3",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "8.20.0~ds+~cs7.1.4-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "8.20.0~ds+~cs7.1.5-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "8.20.0~ds+~cs7.1.6-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "8.20.0~ds+~cs7.1.6-2",
            "evidence": "/affected/0/versions"
          }
        ]
      },
      {
        "name": {
          "value": "node-ajv",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "8.20.0~ds+~cs7.1.4-1",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": [
          {
            "value": "8.12.0~ds+~2.1.1-5",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "8.17.1~ds+~3.0.1+~3.1.0-1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "8.17.1~ds+~3.0.1+~3.1.0-2",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "8.17.1~ds+~3.0.1+~3.1.0-3",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "8.17.1~ds+~3.0.1+~3.1.0-4",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "8.18.0~ds+~cs6.1.1-1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "8.18.0~ds+~cs6.1.1-2",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "8.20.0~ds+~cs6.1.3-1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "8.20.0~ds+~cs7.1.2-1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "8.20.0~ds+~cs7.1.3-1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "8.20.0~ds+~cs7.1.3-2",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "8.20.0~ds+~cs7.1.3-3",
            "evidence": "/affected/1/versions"
          }
        ]
      }
    ],
    "severity": "high",
    "structured": {
      "id": "DEBIAN-CVE-2026-75899",
      "aliases": [
        "DEBIAN-CVE-2026-75899"
      ],
      "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": [
            {
              "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",
            "8.20.0~ds+~cs7.1.6-2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-75899.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "8.20.0~ds+~cs7.1.4-1"
                }
              ]
            }
          ],
          "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"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-75899.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        }
      ],
      "modified": "2026-10-15T10:03:23.039584434Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-75899"
      ],
      "references": [
        "https://security-tracker.debian.org/tracker/CVE-2026-75899"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-75899",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 330479,
  "published_at": "2026-08-24T10:16:39.96+00:00"
}