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Server-Side Request Forgery in nuxt-api-party

Type: advisorySources: OSV

`nuxt-api-party` is an open source module to proxy API requests. nuxt-api-party attempts to check if the user has passed an absolute URL to prevent the aforementioned attack. This has been recently changed to use the regular expression `^https?://`, however this regular expression can be bypassed by an absolute URL with leading whitespace. For example `\nhttps://whatever.com` which has a leading newline. According to the fetch specification, before a fetch is made the URL is normalized. "To normalize a byte sequence potentialValue, remove any leading and trailing HTTP whitespace bytes from potentialValue.". This means the final request will be normalized to `https://whatever.com` bypassing the check and nuxt-api-party will send a request outside of the whitelist. This could allow us to leak credentials or perform Server-Side Request Forgery (SSRF). This vulnerability has been addressed in version 0.22.1. Users are advised to upgrade. Users unable to upgrade should revert to the previous method of detecting absolute URLs.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2023-49799
Confirmed fixed CVEs
Not specified
Updated in this feed
7 Nov 2026, 12:24 UTC · Revision 1

Source evidence

Server-Side Request Forgery in nuxt-api-party

core-osv · Original source

Published 8 Dec 2023, 23:45 UTC

`nuxt-api-party` is an open source module to proxy API requests. nuxt-api-party attempts to check if the user has passed an absolute URL to prevent the aforementioned attack. This has been recently changed to use the regular expression `^https?://`, however this regular expression can be bypassed by an absolute URL with leading whitespace. For example `\nhttps://whatever.com` which has a leading newline. According to the fetch specification, before a fetch is made the URL is normalized. "To normalize a byte sequence potentialValue, remove any leading and trailing HTTP whitespace bytes from potentialValue.". This means the final request will be normalized to `https://whatever.com` bypassing the check and nuxt-api-party will send a request outside of the whitelist. This could allow us to leak credentials or perform Server-Side Request Forgery (SSRF). This vulnerability has been addressed in version 0.22.1. Users are advised to upgrade. Users unable to upgrade should revert to the previous method of detecting absolute URLs.

osv:CVE-2023-49799
Complete source record
{
  "id": "ba2b68359098ed4485e4b81276a44c4d89be06f50bfc5879db751eb397f16673",
  "url": "https://osv.dev/vulnerability/CVE-2023-49799",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Server-Side Request Forgery in nuxt-api-party",
    "summary": "`nuxt-api-party` is an open source module to proxy API requests. nuxt-api-party attempts to check if the user has passed an absolute URL to prevent the aforementioned attack. This has been recently changed to use the regular expression `^https?://`, however this regular expression can be bypassed by an absolute URL with leading whitespace. For example `\\nhttps://whatever.com` which has a leading newline. According to the fetch specification, before a fetch is made the URL is normalized. \"To normalize a byte sequence potentialValue, remove any leading and trailing HTTP whitespace bytes from potentialValue.\". This means the final request will be normalized to `https://whatever.com` bypassing the check and nuxt-api-party will send a request outside of the whitelist. This could allow us to leak credentials or perform Server-Side Request Forgery (SSRF). This vulnerability has been addressed in version 0.22.1. Users are advised to upgrade. Users unable to upgrade should revert to the previous method of detecting absolute URLs.",
    "evidence": "osv:CVE-2023-49799",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2023-49799",
      "aliases": [
        "CVE-2023-49799",
        "GHSA-3wfp-253j-5jxv"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/johannschopplich/nuxt-api-party",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "b13d6eff070631780b75ff134625eb1ffc096faa"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.22.1"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "cpe": "cpe:2.3:a:johannschopplich:nuxt_api_party:*:*:*:*:*:node.js:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "0.21.3"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
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            "v0.21.3",
            "v0.21.2",
            "v0.21.1",
            "v0.21.0",
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            "v0.18.1",
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            "v0.15.1",
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            "v0.14.2",
            "v0.14.1",
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            "v0.9.0",
            "v0.8.2",
            "v0.8.1",
            "v0.8.0",
            "v0.7.2",
            "v0.7.1",
            "v0.7.0",
            "v0.6.5",
            "v0.6.4",
            "v0.6.3",
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            "v0.6.1",
            "v0.6.0",
            "v0.5.6",
            "v0.5.5",
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            "v0.4.0",
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            "v0.1.9",
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            "v0.1.3",
            "v0.1.2",
            "v0.1.1",
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-49799.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:50.825007144Z",
      "provider": "osv",
      "references": [
        "https://fetch.spec.whatwg.org/",
        "https://fetch.spec.whatwg.org/#http-whitespace-byte",
        "https://github.com/johannschopplich/nuxt-api-party/blob/777462e1e3af1d9f8938aa33f230cd8cb6e0cc9a/src/runtime/server/handler.ts#L31",
        "https://infra.spec.whatwg.org/#byte-sequence",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/49xxx/CVE-2023-49799.json",
        "https://github.com/johannschopplich/nuxt-api-party/security/advisories/GHSA-3wfp-253j-5jxv",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-49799"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-918"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/49xxx/CVE-2023-49799.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-49799",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 519275,
  "published_at": "2023-12-08T23:45:18.581+00:00"
}