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Common Weakness Enumeration

CWE-776

Allowed

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

Abstraction: Base · Status: Draft

API response cwe.mitre.org

The product uses XML documents and allows their structure to be defined with a Document Type Definition (DTD), but it does not properly control the number of recursive definitions of entities.

159 vulnerabilities reference this CWE, most recent first.

GHSA-R777-X2JC-XGC6

Vulnerability from github – Published: 2022-05-24 17:31 – Updated: 2022-05-24 17:31
VLAI
Details

An XXE vulnerability exists within LeviStudioU Release Build 2019-09-21 and prior when processing parameter entities, which may allow file disclosure.

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{
  "affected": [],
  "aliases": [
    "CVE-2020-25186"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-776"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2020-10-22T21:15:00Z",
    "severity": "HIGH"
  },
  "details": "An XXE vulnerability exists within LeviStudioU Release Build 2019-09-21 and prior when processing parameter entities, which may allow file disclosure.",
  "id": "GHSA-r777-x2jc-xgc6",
  "modified": "2022-05-24T17:31:58Z",
  "published": "2022-05-24T17:31:58Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-25186"
    },
    {
      "type": "WEB",
      "url": "https://us-cert.cisa.gov/ics/advisories/icsa-20-238-03"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

GHSA-RFHM-XWGJ-V2Q9

Vulnerability from github – Published: 2022-05-24 17:26 – Updated: 2022-05-24 17:26
VLAI
Details

Several XML External Entity (XXE) vulnerabilities in the Moog EXO Series EXVF5C-2 and EXVP7C2-3 units allow remote unauthenticated users to read arbitrary files via a crafted Document Type Definition (DTD) in an XML request.

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{
  "affected": [],
  "aliases": [
    "CVE-2020-24052"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-776"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2020-08-21T15:15:00Z",
    "severity": "MODERATE"
  },
  "details": "Several XML External Entity (XXE) vulnerabilities in the Moog EXO Series EXVF5C-2 and EXVP7C2-3 units allow remote unauthenticated users to read arbitrary files via a crafted Document Type Definition (DTD) in an XML request.",
  "id": "GHSA-rfhm-xwgj-v2q9",
  "modified": "2022-05-24T17:26:19Z",
  "published": "2022-05-24T17:26:19Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-24052"
    },
    {
      "type": "WEB",
      "url": "https://ioac.tv/3hy1xu6"
    },
    {
      "type": "WEB",
      "url": "https://ioactive.com/moog-exo-series-multiple-vulnerabilities"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

GHSA-RPCF-XW9J-7C7J

Vulnerability from github – Published: 2022-05-17 01:59 – Updated: 2024-02-02 15:30
VLAI
Details

jabberd2 before 2.2.14 does not properly detect recursion during entity expansion, which allows remote attackers to cause a denial of service (memory and CPU consumption) via a crafted XML document containing a large number of nested entity references, a similar issue to CVE-2003-1564.

Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2011-1755"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-776"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2011-06-21T02:52:00Z",
    "severity": "MODERATE"
  },
  "details": "jabberd2 before 2.2.14 does not properly detect recursion during entity expansion, which allows remote attackers to cause a denial of service (memory and CPU consumption) via a crafted XML document containing a large number of nested entity references, a similar issue to CVE-2003-1564.",
  "id": "GHSA-rpcf-xw9j-7c7j",
  "modified": "2024-02-02T15:30:27Z",
  "published": "2022-05-17T01:59:37Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2011-1755"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=700390"
    },
    {
      "type": "WEB",
      "url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/67770"
    },
    {
      "type": "WEB",
      "url": "https://hermes.opensuse.org/messages/9197650"
    },
    {
      "type": "WEB",
      "url": "http://codex.xiaoka.com/svn/jabberd2/tags/jabberd-2.2.14/ChangeLog"
    },
    {
      "type": "WEB",
      "url": "http://lists.apple.com/archives/Security-announce/2011//Oct/msg00003.html"
    },
    {
      "type": "WEB",
      "url": "http://lists.fedoraproject.org/pipermail/package-announce/2011-June/061341.html"
    },
    {
      "type": "WEB",
      "url": "http://lists.fedoraproject.org/pipermail/package-announce/2011-June/061458.html"
    },
    {
      "type": "WEB",
      "url": "http://lists.fedoraproject.org/pipermail/package-announce/2011-June/061482.html"
    },
    {
      "type": "WEB",
      "url": "http://secunia.com/advisories/44787"
    },
    {
      "type": "WEB",
      "url": "http://secunia.com/advisories/44957"
    },
    {
      "type": "WEB",
      "url": "http://secunia.com/advisories/45112"
    },
    {
      "type": "WEB",
      "url": "http://support.apple.com/kb/HT5002"
    },
    {
      "type": "WEB",
      "url": "http://www.mail-archive.com/jabberd2%40lists.xiaoka.com/msg01655.html"
    },
    {
      "type": "WEB",
      "url": "http://www.mail-archive.com/jabberd2@lists.xiaoka.com/msg01655.html"
    },
    {
      "type": "WEB",
      "url": "http://www.redhat.com/support/errata/RHSA-2011-0881.html"
    },
    {
      "type": "WEB",
      "url": "http://www.redhat.com/support/errata/RHSA-2011-0882.html"
    },
    {
      "type": "WEB",
      "url": "http://www.securityfocus.com/bid/48250"
    }
  ],
  "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"
    }
  ]
}

GHSA-RPRC-6FR2-45V9

Vulnerability from github – Published: 2022-05-24 17:09 – Updated: 2022-05-24 17:09
VLAI
Details

An issue was discovered in SmartClient 12.0. The Remote Procedure Call (RPC) saveFile provided by the console functionality on the /tools/developerConsoleOperations.jsp (or /isomorphic/IDACall) URL allows an unauthenticated attacker to overwrite files via vectors involving an XML comment and /.. path traversal.

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{
  "affected": [],
  "aliases": [
    "CVE-2020-9354"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-776"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2020-02-23T02:15:00Z",
    "severity": "MODERATE"
  },
  "details": "An issue was discovered in SmartClient 12.0. The Remote Procedure Call (RPC) saveFile provided by the console functionality on the /tools/developerConsoleOperations.jsp (or /isomorphic/IDACall) URL allows an unauthenticated attacker to overwrite files via vectors involving an XML comment and /.. path traversal.",
  "id": "GHSA-rprc-6fr2-45v9",
  "modified": "2022-05-24T17:09:30Z",
  "published": "2022-05-24T17:09:30Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-9354"
    },
    {
      "type": "WEB",
      "url": "https://seclists.org/fulldisclosure/2020/Feb/18"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

GHSA-RVWF-54QP-4R6V

Vulnerability from github – Published: 2021-06-04 21:37 – Updated: 2022-08-11 21:47
VLAI
Summary
SnakeYAML Entity Expansion during load operation
Details

The Alias feature in SnakeYAML 1.18 allows entity expansion during a load operation, a related issue to CVE-2003-1564.

Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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{
  "affected": [
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.yaml:snakeyaml"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.26"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2017-18640"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-776"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2021-06-04T21:34:16Z",
    "nvd_published_at": "2019-12-12T03:15:00Z",
    "severity": "HIGH"
  },
  "details": "The Alias feature in SnakeYAML 1.18 allows entity expansion during a load operation, a related issue to CVE-2003-1564.",
  "id": "GHSA-rvwf-54qp-4r6v",
  "modified": "2022-08-11T21:47:32Z",
  "published": "2021-06-04T21:37:45Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2017-18640"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread.html/rcb2a7037366c58bac6aec6ce3df843a11ef97ae4eb049f05f410eaa5@%3Ccommon-commits.hadoop.apache.org%3E"
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    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread.html/r4c682fb8cf69dd14162439656a6ebdf42ea6ad0e4edba95907ea3f14@%3Ccommits.servicecomb.apache.org%3E"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread.html/r4d7f37da1bc2df90a5a0f56eb7629b5ea131bfe11eeeb4b4c193f64a@%3Ccommon-issues.hadoop.apache.org%3E"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread.html/r5510f0125ba409fc1cabd098ab8b457741e5fa314cbd0e61e4339422@%3Cdev.atlas.apache.org%3E"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread.html/r55d807f31e64a080c54455897c20b1667ec792e5915132c7b7750533@%3Ccommits.cassandra.apache.org%3E"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread.html/r56805265475919252ba7fc10123f15b91097f3009bae86476624ca25@%3Ccommits.cassandra.apache.org%3E"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread.html/r643ba53f002ae59068f9352fe1d82e1b6f375387ffb776f13efe8fda@%3Ccommon-issues.hadoop.apache.org%3E"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread.html/r666f29a7d0e1f98fa1425ca01efcfa86e6e3856e01d300828aa7c6ea@%3Ccommits.pulsar.apache.org%3E"
    }
  ],
  "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": "SnakeYAML Entity Expansion during load operation"
}

GHSA-VMWR-MC7X-5VC3

Vulnerability from github – Published: 2024-08-22 16:40 – Updated: 2025-11-03 22:47
VLAI
Summary
REXML denial of service vulnerability
Details

Impact

The REXML gem before 3.3.6 has a DoS vulnerability when it parses an XML that has many deep elements that have same local name attributes.

If you need to parse untrusted XMLs with tree parser API like REXML::Document.new, you may be impacted to this vulnerability. If you use other parser APIs such as stream parser API and SAX2 parser API, this vulnerability is not affected.

Patches

The REXML gem 3.3.6 or later include the patch to fix the vulnerability.

Workarounds

Don't parse untrusted XMLs with tree parser API.

References

  • https://www.ruby-lang.org/en/news/2024/08/22/dos-rexml-cve-2024-43398/ : An announce on www.ruby-lang.org
Severity
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
8.2 (High)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Show details on source website
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "RubyGems",
        "name": "rexml"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.3.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2024-43398"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-776"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2024-08-22T16:40:46Z",
    "nvd_published_at": "2024-08-22T15:15:16Z",
    "severity": "HIGH"
  },
  "details": "### Impact\n\nThe REXML gem before 3.3.6 has a DoS vulnerability when it parses an XML that has many deep elements that have same local name attributes.\n\nIf you need to parse untrusted XMLs with tree parser API like `REXML::Document.new`, you may be impacted to this vulnerability. If you use other parser APIs such as stream parser API and SAX2 parser API, this vulnerability is not affected.\n\n### Patches\n\nThe REXML gem 3.3.6 or later include the patch to fix the vulnerability.\n\n### Workarounds\n\nDon\u0027t parse untrusted XMLs with tree parser API.\n\n### References\n\n* https://www.ruby-lang.org/en/news/2024/08/22/dos-rexml-cve-2024-43398/ : An announce on www.ruby-lang.org",
  "id": "GHSA-vmwr-mc7x-5vc3",
  "modified": "2025-11-03T22:47:47Z",
  "published": "2024-08-22T16:40:46Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/ruby/rexml/security/advisories/GHSA-vmwr-mc7x-5vc3"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-43398"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ruby/rexml/commit/7cb5eaeb221c322b9912f724183294d8ce96bae3"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/ruby/rexml"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ruby/rexml/releases/tag/v3.3.6"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/rexml/CVE-2024-43398.yml"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00011.html"
    },
    {
      "type": "WEB",
      "url": "https://security.netapp.com/advisory/ntap-20250103-0006"
    },
    {
      "type": "WEB",
      "url": "https://www.ruby-lang.org/en/news/2024/08/22/dos-rexml-cve-2024-43398"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "REXML denial of service vulnerability"
}

GHSA-W42R-MRX7-C633

Vulnerability from github – Published: 2025-07-07 12:30 – Updated: 2025-07-07 23:59
VLAI
Summary
LlamaIndex has an XML Entity Expansion vulnerability in its sitemap parser
Details

An XML Entity Expansion vulnerability, also known as a 'billion laughs' attack, exists in the sitemap parser of the run-llama/llama_index repository, specifically affecting the Papers Loaders package before version 0.3.2 (in llama-index v0.10.0 and above through v0.12.29). This vulnerability allows an attacker to supply a malicious Sitemap XML, leading to a Denial of Service (DoS) by exhausting system memory and potentially causing a system crash. The issue is resolved in version 0.3.2 (in llama-index 0.12.29).

Severity
7.5 (High)
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Show details on source website
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "llama-index-readers-papers"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.3.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-3225"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-776"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-07-07T23:59:01Z",
    "nvd_published_at": "2025-07-07T10:15:27Z",
    "severity": "HIGH"
  },
  "details": "An XML Entity Expansion vulnerability, also known as a \u0027billion laughs\u0027 attack, exists in the sitemap parser of the run-llama/llama_index repository, specifically affecting the Papers Loaders package before version 0.3.2 (in llama-index v0.10.0 and above through v0.12.29). This vulnerability allows an attacker to supply a malicious Sitemap XML, leading to a Denial of Service (DoS) by exhausting system memory and potentially causing a system crash. The issue is resolved in version 0.3.2 (in llama-index 0.12.29).",
  "id": "GHSA-w42r-mrx7-c633",
  "modified": "2025-07-07T23:59:01Z",
  "published": "2025-07-07T12:30:22Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-3225"
    },
    {
      "type": "WEB",
      "url": "https://github.com/run-llama/llama_index/commit/4f6ee062b19212106a2632af9c9521fc7f0a3584"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/run-llama/llama_index"
    },
    {
      "type": "WEB",
      "url": "https://huntr.com/bounties/e33c0699-e9a2-49aa-837b-5363205637a2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "LlamaIndex has an XML Entity Expansion vulnerability in its sitemap parser"
}

GHSA-W4WG-C34C-JF6J

Vulnerability from github – Published: 2025-08-12 15:31 – Updated: 2025-08-12 15:31
VLAI
Details

XEE in Ivanti Connect Secure before 22.7R2.8 or 22.8R2, Ivanti Policy Secure before 22.7R1.5, Ivanti ZTA Gateway before 22.8R2.3-723 and Ivanti Neurons for Secure Access before 22.8R1.4 (Fix deployed on 02-Aug-2025) allows a remote authenticated attacker with admin privileges to trigger a denial of service

Severity
4.9 (Medium)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Show details on source website
To clipboard 

{
  "affected": [],
  "aliases": [
    "CVE-2025-5466"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-776"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-08-12T15:15:31Z",
    "severity": "MODERATE"
  },
  "details": "XEE in Ivanti Connect Secure before 22.7R2.8 or 22.8R2, Ivanti Policy Secure before 22.7R1.5, Ivanti ZTA Gateway before 22.8R2.3-723 and Ivanti Neurons for Secure Access before 22.8R1.4 (Fix deployed on 02-Aug-2025) allows a remote authenticated attacker with admin privileges to trigger a denial of service",
  "id": "GHSA-w4wg-c34c-jf6j",
  "modified": "2025-08-12T15:31:20Z",
  "published": "2025-08-12T15:31:20Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-5466"
    },
    {
      "type": "WEB",
      "url": "https://forums.ivanti.com/s/article/August-Security-Advisory-Ivanti-Connect-Secure-Policy-Secure-ZTA-Gateways-Multiple-CVEs?language=en_US"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-W545-WJM2-RF4H

Vulnerability from github – Published: 2026-07-17 21:31 – Updated: 2026-07-17 21:31
VLAI
Details

IBM Engineering Lifecycle Management 7.0.3 ( Interim Fix 001 through ) Interim Fix 021, 7.1.0 ( Interim Fix 001 through ) Interim Fix 009, and 7.2.0 and 7.2.0 Interim Fix 001 DOORS could allow a remote attacker to cause a denial of service due to improper handling of XML entity expansion.

Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Show details on source website
To clipboard 

{
  "affected": [],
  "aliases": [
    "CVE-2026-14979"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-776"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-17T20:17:15Z",
    "severity": "MODERATE"
  },
  "details": "IBM Engineering Lifecycle Management 7.0.3 ( Interim Fix 001 through ) Interim Fix 021, 7.1.0 ( Interim Fix 001 through ) Interim Fix 009, and 7.2.0 and 7.2.0 Interim Fix 001 DOORS could allow a remote attacker to cause a denial of service due to improper handling of XML entity expansion.",
  "id": "GHSA-w545-wjm2-rf4h",
  "modified": "2026-07-17T21:31:43Z",
  "published": "2026-07-17T21:31:43Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-14979"
    },
    {
      "type": "WEB",
      "url": "https://www.ibm.com/support/pages/node/7279963"
    }
  ],
  "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:L",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-WCGR-63G6-PJ93

Vulnerability from github – Published: 2022-05-24 19:07 – Updated: 2022-05-24 19:07
VLAI
Details

A flaw was found in libxml2. Exponential entity expansion attack its possible bypassing all existing protection mechanisms and leading to denial of service.

Show details on source website
To clipboard 

{
  "affected": [],
  "aliases": [
    "CVE-2021-3541"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-776"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2021-07-09T17:15:00Z",
    "severity": "MODERATE"
  },
  "details": "A flaw was found in libxml2. Exponential entity expansion attack its possible bypassing all existing protection mechanisms and leading to denial of service.",
  "id": "GHSA-wcgr-63g6-pj93",
  "modified": "2022-05-24T19:07:20Z",
  "published": "2022-05-24T19:07:20Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-3541"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1950515"
    },
    {
      "type": "WEB",
      "url": "https://security.netapp.com/advisory/ntap-20210805-0007"
    },
    {
      "type": "WEB",
      "url": "https://www.oracle.com/security-alerts/cpujan2022.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}
Mitigation
Operation

If possible, prohibit the use of DTDs or use an XML parser that limits the expansion of recursive DTD entities.

Mitigation
Implementation

Before parsing XML files with associated DTDs, scan for recursive entity declarations and do not continue parsing potentially explosive content.

CAPEC-197: Exponential Data Expansion

An adversary submits data to a target application which contains nested exponential data expansion to produce excessively large output. Many data format languages allow the definition of macro-like structures that can be used to simplify the creation of complex structures. However, this capability can be abused to create excessive demands on a processor's CPU and memory. A small number of nested expansions can result in an exponential growth in demands on memory.

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