Vulnerability-Lookup

CVE-2026-73569 (GCVE-0-2026-73569)

Vulnerability from cvelistv5 – Published: 2026-08-13 17:45 – Updated: 2026-08-13 18:40

Title

fast-xml-parser: Repeated DOCTYPE declarations reset entity expansion limits

Summary

fast-xml-parser allows users to process XML from JS object without C/C++ based libraries or callbacks. From 5.9.3 until 5.10.1, src/xmlparser/OrderedObjParser.js processes multiple DOCTYPE declarations within a single XML document and passes each declaration's entities through addInputEntities(). addInputEntities() resets maxTotalExpansions and maxExpandedLength every time it is called, allowing additional DOCTYPE declarations to repeatedly reset the configured entity-expansion limits during one parse operation. A crafted XML document can then cause excessive CPU use, event-loop blocking, memory exhaustion, and process termination. This issue is fixed in version 5.10.1.

Severity

8.7 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-13 18:39 UTC

CWE

CWE-776 - Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7760 records in the last 180 days details

References

3 references

URL	Tags
https://github.com/NaturalIntelligence/fast-xml-p…	x_refsource_CONFIRM
https://github.com/NaturalIntelligence/fast-xml-p…	x_refsource_MISC
https://github.com/NaturalIntelligence/fast-xml-p…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
NaturalIntelligence	fast-xml-parser	Affected: >= 5.9.3, < 5.10.1	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-73569

Vulnerability from fkie_nvd - Published: 2026-08-13 18:18 - Updated: 2026-10-24 15:10

Severity

8.7 (High) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/NaturalIntelligence/fast-xml-parser/commit/4e546e03987662de5495d050b5fba26bea65383f
	security-advisories@github.com	https://github.com/NaturalIntelligence/fast-xml-parser/releases/tag/v5.10.1
	security-advisories@github.com	https://github.com/NaturalIntelligence/fast-xml-parser/security/advisories/GHSA-8r6m-32jq-jx6q

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "fast-xml-parser",
          "vendor": "NaturalIntelligence",
          "versions": [
            {
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              "version": "\u003e= 5.9.3, \u003c 5.10.1"
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    },
    {
      "lang": "es",
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    }
  ],
  "id": "CVE-2026-73569",
  "lastModified": "2026-10-24T15:10:00.190",
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            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-13T18:39:55.393516Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-13T18:18:19.803",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/NaturalIntelligence/fast-xml-parser/commit/4e546e03987662de5495d050b5fba26bea65383f"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/NaturalIntelligence/fast-xml-parser/releases/tag/v5.10.1"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/NaturalIntelligence/fast-xml-parser/security/advisories/GHSA-8r6m-32jq-jx6q"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-776"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

GHSA-8R6M-32JQ-JX6Q

Vulnerability from github – Published: 2026-07-21 22:06 – Updated: 2026-08-13 17:45

Summary

fast-xml-parser: Repeated DOCTYPE declarations reset entity expansion limits

Details

Impact

fast-xml-parser processes multiple "DOCTYPE" declarations within a single XML document. Each declaration passes its entities to @nodable/entities through addInputEntities().

addInputEntities() resets the entity expansion counters every time it is called. An attacker can therefore insert additional DOCTYPE declarations to repeatedly reset maxTotalExpansions and maxExpandedLength during one parse operation.

This allows a crafted XML document to exceed the configured entity-expansion limits and can cause excessive CPU use, event-loop blocking, memory exhaustion, and process termination.

Workarounds

Manually check if multiple DOCTYPEs are not present in input contents
Update to v5.10.1
Keep processEntity flag off

Severity

8.7 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "fast-xml-parser"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.9.3"
            },
            {
              "fixed": "5.10.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-73569"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-776"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-21T22:06:36Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "### Impact\n`fast-xml-parser` processes multiple \"DOCTYPE\" declarations within a single XML document. Each declaration passes its entities to `@nodable/entities` through `addInputEntities()`.\n\n`addInputEntities()` resets the entity expansion counters every time it is called. An attacker can therefore insert additional DOCTYPE declarations to repeatedly reset maxTotalExpansions and maxExpandedLength during one parse operation.\n\nThis allows a crafted XML document to exceed the configured entity-expansion limits and can cause excessive CPU use, event-loop blocking, memory exhaustion, and process termination.\n\n### Workarounds\n- Manually check if multiple DOCTYPEs are not present in input contents\n- Update to v5.10.1\n- Keep `processEntity` flag off",
  "id": "GHSA-8r6m-32jq-jx6q",
  "modified": "2026-08-13T17:45:28Z",
  "published": "2026-07-21T22:06:36Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/NaturalIntelligence/fast-xml-parser/security/advisories/GHSA-8r6m-32jq-jx6q"
    },
    {
      "type": "WEB",
      "url": "https://github.com/NaturalIntelligence/fast-xml-parser/commit/4e546e03987662de5495d050b5fba26bea65383f"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/NaturalIntelligence/fast-xml-parser"
    },
    {
      "type": "WEB",
      "url": "https://github.com/NaturalIntelligence/fast-xml-parser/releases/tag/v5.10.1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "fast-xml-parser: Repeated DOCTYPE declarations reset entity expansion limits"
}

RHSA-2026:65130

Vulnerability from csaf_redhat - Published: 2026-09-08 08:06 - Updated: 2026-10-26 13:32

Summary

Red Hat Security Advisory: Red Hat OpenShift Data Foundation 4.22.3 security, enhancement & bug fix update

Severity

Important

Scope

4 vulnerabilities in this advisory, including CVE-2026-73569.

CVE-2026-73569

A flaw was found in fast-xml-parser. A remote attacker could exploit this by submitting a specially crafted XML document containing multiple DOCTYPE declarations. These repeated declarations can reset internal entity expansion limits during parsing. This can lead to excessive CPU usage, event-loop blocking, and memory exhaustion, ultimately resulting in a Denial of Service (DoS) for the application processing the XML.

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Fixed: 109 products Known not affected: 16 products

https://access.redhat.com/errata/RHSA-2026:65130

Open the full advisory

RHSA-2026:66003

Vulnerability from csaf_redhat - Published: 2026-09-09 13:39 - Updated: 2026-10-26 11:11

Summary

Red Hat Security Advisory: Ansible automation portal Red Hat Enterprise Linux Images

Severity

Important

Scope

12 vulnerabilities in this advisory, including CVE-2026-73569.

CVE-2026-73569

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Fixed: 1 product

https://access.redhat.com/errata/RHSA-2026:66003

Open the full advisory

RHSA-2026:67724

Vulnerability from csaf_redhat - Published: 2026-09-16 00:35 - Updated: 2026-10-22 05:59

Summary

Red Hat Security Advisory: Migration Toolkit for Applications

Severity

Important

Scope

4 vulnerabilities in this advisory, including CVE-2026-73569.

CVE-2026-73569

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Fixed: 2 products Known not affected: 25 products

https://access.redhat.com/errata/RHSA-2026:67724

Open the full advisory

UBUNTU-CVE-2026-73569 (CVE-2026-73569)

Vulnerability from osv_ubuntu – Published: 2026-08-13 18:18 – Updated: 2026-10-17 09:51 – Source website

Details

Severity

8.7 (High)


                    
                      CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-73569	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-73569	REPORT
	https://github.com/NaturalIntelligence/fast-xml-p…	REPORT
	https://github.com/NaturalIntelligence/fast-xml-p…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "node-webfont",
            "binary_version": "11.4.0+dfsg2+~cs35.7.26-7ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "node-webfont",
        "purl": "pkg:deb/ubuntu/node-webfont@11.4.0+dfsg2+~cs35.7.26-7ubuntu1?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "11.4.0+dfsg2+~cs35.7.26-7ubuntu1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "node-webfont",
            "binary_version": "11.4.0+dfsg2+~cs35.7.26-19"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.10",
        "name": "node-webfont",
        "purl": "pkg:deb/ubuntu/node-webfont@11.4.0+dfsg2+~cs35.7.26-19?arch=source\u0026distro=stonking"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "11.4.0+dfsg2+~cs35.7.26-18",
        "11.4.0+dfsg2+~cs35.7.26-19"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "node-webfont",
            "binary_version": "11.4.0+dfsg2+~cs35.7.26-18"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "node-webfont",
        "purl": "pkg:deb/ubuntu/node-webfont@11.4.0+dfsg2+~cs35.7.26-18?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "11.4.0+dfsg2+~cs35.7.26-13ubuntu2",
        "11.4.0+dfsg2+~cs35.7.26-14",
        "11.4.0+dfsg2+~cs35.7.26-15",
        "11.4.0+dfsg2+~cs35.7.26-16build1",
        "11.4.0+dfsg2+~cs35.7.26-18"
      ]
    }
  ],
  "aliases": [],
  "details": "fast-xml-parser allows users to process XML from JS object without C/C++ based libraries or callbacks. From 5.9.3 until 5.10.1, src/xmlparser/OrderedObjParser.js processes multiple DOCTYPE declarations within a single XML document and passes each declaration\u0027s entities through addInputEntities(). addInputEntities() resets maxTotalExpansions and maxExpandedLength every time it is called, allowing additional DOCTYPE declarations to repeatedly reset the configured entity-expansion limits during one parse operation. A crafted XML document can then cause excessive CPU use, event-loop blocking, memory exhaustion, and process termination. This issue is fixed in version 5.10.1.",
  "id": "UBUNTU-CVE-2026-73569",
  "modified": "2026-10-17T09:51:13Z",
  "published": "2026-08-13T18:18:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-73569"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-73569"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/NaturalIntelligence/fast-xml-parser/security/advisories/GHSA-8r6m-32jq-jx6q"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/NaturalIntelligence/fast-xml-parser/commit/4e546e03987662de5495d050b5fba26bea65383f"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-73569"
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-73569 (GCVE-0-2026-73569)

FKIE_CVE-2026-73569

GHSA-8R6M-32JQ-JX6Q

Impact

Workarounds

RHSA-2026:65130

RHSA-2026:66003

RHSA-2026:67724

UBUNTU-CVE-2026-73569 (CVE-2026-73569)

Tags

Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour