Vulnerability-Lookup

CVE-2026-83611 (GCVE-0-2026-83611)

Vulnerability from cvelistv5 – Published: 2026-09-01 14:34 – Updated: 2026-09-01 14:53

Title

xmldom: Parser silently accepts a not-well-formed end tag whose name is followed by a line break and trailing content

Summary

xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. Prior to @xmldom/xmldom versions 0.8.15 and 0.9.12, and in xmldom version 0.6.0 and earlier, DOMParser.parseFromString() can silently accept an end tag such as </a\njunk>, close the element, and discard the trailing content. On 0.9.x, the lib/sax.js end-tag validator inherits the multiline flag from reg(), allowing the first line to satisfy the anchored XML ETag production; older lines have no equivalent residue validation. This parser differential can bypass a parse-before-trust well-formedness gate, although it does not inject the discarded content; onError on 0.9.x and errorHandler on 0.8.x are the relevant reporting interfaces. This issue is fixed in @xmldom/xmldom versions 0.8.15 and 0.9.12; no fixed version is available for xmldom.

Severity

6.9 (Medium)


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

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-01 14:53 UTC

CWE

CWE-1286 - Improper Validation of Syntactic Correctness of Input

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7771 records in the last 180 days details

References

7 references

URL	Tags
https://github.com/xmldom/xmldom/security/advisor…	x_refsource_CONFIRM
https://github.com/xmldom/xmldom/pull/1071	x_refsource_MISC
https://github.com/xmldom/xmldom/pull/1072	x_refsource_MISC
https://github.com/xmldom/xmldom/commit/443018966…	x_refsource_MISC
https://github.com/xmldom/xmldom/commit/7b2ec67e1…	x_refsource_MISC
https://github.com/xmldom/xmldom/releases/tag/0.8.15	x_refsource_MISC
https://github.com/xmldom/xmldom/releases/tag/0.9.12	x_refsource_MISC

Impacted products

2 products

Vendor	Product	Version	CPE status
xmldom	xmldom	Affected: <= 0.6.0	guessed
@xmldom	xmldom	Affected: >= 0.9.0, < 0.9.12 Affected: >= 0.7.0, < 0.8.15	guessed

Show details on NVD website

JSON

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          ],
          "source": {
            "advisory": "GHSA-6h8r-xr42-gp59",
            "discovery": "UNKNOWN"
          },
          "title": "xmldom: Parser silently accepts a not-well-formed end tag whose name is followed by a line break and trailing content"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "assignerShortName": "GitHub_M",
        "cveId": "CVE-2026-83611",
        "datePublished": "2026-09-01T14:34:12.618Z",
        "dateReserved": "2026-08-31T20:36:25.744Z",
        "dateUpdated": "2026-09-01T14:53:37.513Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}

CLEANSTART-2026-UU21916 (CVE-2026-83611)

Vulnerability from cleanstart – Published: 2026-10-10 00:47 – Updated: 2026-10-09 11:32 – Source website

Summary

xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module

Details

Security vulnerability affects the n8n package. xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module.

Severity

6.9 (Medium)


                    
                      CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

References

URL

Type

	https://github.com/cleanstart-dev/cleanstart-secu…	ADVISORY
	https://osv.dev/vulnerability/CVE-2026-83611	WEB
	https://nvd.nist.gov/vuln/detail/CVE-2026-83611	WEB

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "CleanStart",
        "name": "n8n",
        "purl": "pkg:apk/cleanstart/n8n"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.28.0-r4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "credits": [],
  "database_specific": {},
  "details": "Security vulnerability affects the n8n package. xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module.",
  "id": "CLEANSTART-2026-UU21916",
  "modified": "2026-10-09T11:32:43Z",
  "published": "2026-10-10T00:47:57.204490Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/cleanstart-dev/cleanstart-security-advisories/tree/main/advisories/2026/CLEANSTART-2026-UU21916.json"
    },
    {
      "type": "WEB",
      "url": "https://osv.dev/vulnerability/CVE-2026-83611"
    },
    {
      "type": "WEB",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-83611"
    }
  ],
  "related": [],
  "schema_version": "1.7.3",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ],
  "summary": "xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module",
  "upstream": [
    "CVE-2026-83611"
  ]
}

FKIE_CVE-2026-83611

Vulnerability from fkie_nvd - Published: 2026-09-01 15:17 - Updated: 2026-09-08 21:11

Severity

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

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/xmldom/xmldom/commit/4430189660b0d380ee9c9ee7550a1358688e8828
	security-advisories@github.com	https://github.com/xmldom/xmldom/commit/7b2ec67e1750daadd0bb06c92e875e726544a362
	security-advisories@github.com	https://github.com/xmldom/xmldom/pull/1071
	security-advisories@github.com	https://github.com/xmldom/xmldom/pull/1072
	security-advisories@github.com	https://github.com/xmldom/xmldom/releases/tag/0.8.15
	security-advisories@github.com	https://github.com/xmldom/xmldom/releases/tag/0.9.12
	security-advisories@github.com	https://github.com/xmldom/xmldom/security/advisories/GHSA-6h8r-xr42-gp59
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/xmldom/xmldom/security/advisories/GHSA-6h8r-xr42-gp59

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "xmldom",
          "vendor": "xmldom",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c= 0.6.0"
            }
          ]
        },
        {
          "product": "xmldom",
          "vendor": "@xmldom",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 0.9.0, \u003c 0.9.12"
            },
            {
              "status": "affected",
              "version": "\u003e= 0.7.0, \u003c 0.8.15"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. Prior to @xmldom/xmldom versions 0.8.15 and 0.9.12, and in xmldom version 0.6.0 and earlier, DOMParser.parseFromString() can silently accept an end tag such as \u003c/a\\njunk\u003e, close the element, and discard the trailing content. On 0.9.x, the lib/sax.js end-tag validator inherits the multiline flag from reg(), allowing the first line to satisfy the anchored XML ETag production; older lines have no equivalent residue validation. This parser differential can bypass a parse-before-trust well-formedness gate, although it does not inject the discarded content; onError on 0.9.x and errorHandler on 0.8.x are the relevant reporting interfaces. This issue is fixed in @xmldom/xmldom versions 0.8.15 and 0.9.12; no fixed version is available for xmldom."
    }
  ],
  "id": "CVE-2026-83611",
  "lastModified": "2026-09-08T21:11:31.703",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 6.9,
          "baseSeverity": "MEDIUM",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "LOW",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-83611",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-09-01T14:53:15.050065Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-09-01T15:17:39.263",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/xmldom/xmldom/commit/4430189660b0d380ee9c9ee7550a1358688e8828"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/xmldom/xmldom/commit/7b2ec67e1750daadd0bb06c92e875e726544a362"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/xmldom/xmldom/pull/1071"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/xmldom/xmldom/pull/1072"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/xmldom/xmldom/releases/tag/0.8.15"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/xmldom/xmldom/releases/tag/0.9.12"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/xmldom/xmldom/security/advisories/GHSA-6h8r-xr42-gp59"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/xmldom/xmldom/security/advisories/GHSA-6h8r-xr42-gp59"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-1286"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}

GHSA-6H8R-XR42-GP59

Vulnerability from github – Published: 2026-09-08 21:02 – Updated: 2026-09-08 21:02

Summary

xmldom: Parser silently accepts a not-well-formed end tag whose name is followed by a line break and trailing content

Details

Summary

xmldom's parser silently accepts a not-well-formed end tag whose valid name is followed by trailing content — e.g. </a⏎junk>. The element is closed, the trailing content is discarded, and no error is reported, even though the XML end-tag production allows only optional whitespace after the name and both Chromium and Firefox reject such input as application/xml. An application that relies on xmldom to reject not-well-formed input therefore receives a false "valid" result for a document the specification and browsers consider malformed.

Details

Across every affected version, an end tag whose valid Name is followed by trailing content before > is silently accepted: the element is closed, the residue is dropped, and no error is reported. How much leaks differs by line (see Affected Versions), but the observable weakness is the same.

On the current (0.9.x) line, the parser validates the end-tag name against the XML ETag production with an anchored regular expression (^ QName S? $). That expression is compiled with the m (multiline) flag by a shared builder, so $ matches at an interior line terminator: a valid name on the first line satisfies the anchored production and any content after the line break escapes the check. On 0.9.x the whitespace-separated variant (</a junk>) is already rejected; only the line-terminator variant leaks. Older lines have no anchored end-tag validator at all, so they accept both the line-terminator and the whitespace variant.

This is not content injection — the trailing content is dropped, and the resulting DOM is a normal single-root document (<a/>). The security-relevant property is the silent acceptance of not-well-formed input: xmldom's parse result disagrees with the specification and with browser XML parsers, so any control that treats "xmldom parsed it without error" as "well-formed" is bypassed.

Root Cause

On the 0.9.x line, where the line-terminator variant specifically leaks:

A shared regexp builder compiles anchored productions with the m flag.
^…$ under m are line anchors, not string anchors.
The anchored end-tag production ^ QName S? $ is therefore satisfied by the first line alone, so trailing content after a line terminator is neither matched nor rejected — the malformed end tag is accepted and the residue silently discarded.

The triggering line terminators are the ECMAScript LineTerminator set: U+000A, U+000D, U+2028, U+2029. U+2028 and U+2029 are not XML whitespace, so they are non-conforming trailing content that nonetheless leaks because the JavaScript $ anchor treats them as line boundaries under m.

Affected Versions

Both maintained versions are affected and fixed:

0.9.x (>= 0.9.0, <= 0.9.11) → 0.9.12: the anchored end-tag validator's m flag leaks the line-terminator variant. The whitespace variant (</a junk>) is already rejected on this line.
0.8.x (>= 0.8.0, <= 0.8.14) → 0.8.15: no anchored end-tag validator at all — both the line-terminator and the whitespace variant are silently accepted; the fix adds a residue check.

release-0.7.x (<= 0.7.13) and the unscoped xmldom package (range *, last release 0.6.0) are affected but will not be patched — they are end-of-life / unmaintained. They share the older-line behavior (both variants silently accepted, residue dropped).

Proof of Concept

const { DOMParser, XMLSerializer } = require('@xmldom/xmldom');
const doc = new DOMParser().parseFromString('<a></a\njunk>', 'text/xml'); // no error
console.log(new XMLSerializer().serializeToString(doc));
// Observed: <a/>   — the malformed end tag is accepted, "junk" silently discarded, no error reported.
// Expected (per XML spec / Chromium / Firefox): a parse error — the input is not well-formed.

Impact

Silent acceptance of not-well-formed XML: a document the specification and browser XML parsers reject is parsed without error.
Bypass of a well-formedness / parse-before-trust gate: an application relying on xmldom to reject malformed input treats such a document as valid. Note this is an input-validation / parser-differential issue, not content injection — the trailing content is discarded.

Fix Applied

The parser now reports a not-well-formed end tag whose valid name is followed by trailing content, on both 0.9.12 and 0.8.15 — previously it was accepted silently — and parsing recovers to the byte-identical DOM as before.\ On 0.9.12 the anchored end-tag validator is corrected so a line break followed by trailing content no longer satisfies it, reported as a recoverable error when parsing as XML and a warning when parsing as HTML.\ On 0.8.15, which previously performed no end-tag residue validation, an equivalent residue check is added, reported as a recoverable error in both XML and HTML.\ Well-formed documents are unaffected.

Because the report is recoverable, the fix is non-breaking: no previously-parsed document begins to throw and no serialized output changes. Consumers that want strict rejection can escalate the reported error to a fatal one via the parser's error handler (onError in 0.9.12, errorHandler in 0.8.15). The two versions also differ in the whitespace-separated variant (</a junk>): 0.9.12 already rejected it with a fatal error in XML and continues to, while 0.8.15 — which validated neither variant — now emits the same recoverable report for both the whitespace and line-break variants.

Residual limitation

By default the parser still recovers (it does not reject the document); the reported condition is a recoverable error/warning, not a fatal error, to avoid changing the parsed output in a patch release. Converting this and the other not-well-formed-acceptance cases to a consistent fatalError — including the broader end-tag leniency on the older versions — is deferred to the next breaking release, tracked at xmldom/xmldom#1074.

Severity

6.9 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 0.8.14"
      },
      "package": {
        "ecosystem": "npm",
        "name": "@xmldom/xmldom"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.7.0"
            },
            {
              "fixed": "0.8.15"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 0.9.11"
      },
      "package": {
        "ecosystem": "npm",
        "name": "@xmldom/xmldom"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.9.0"
            },
            {
              "fixed": "0.9.12"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "xmldom"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "0.6.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-83611"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1286"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-08T21:02:13Z",
    "nvd_published_at": "2026-09-01T15:17:39Z",
    "severity": "MODERATE"
  },
  "details": "## Summary\n\nxmldom\u0027s parser silently accepts a **not-well-formed end tag** whose valid name is followed by\ntrailing content \u2014 e.g. `\u003c/a\u23cejunk\u003e`. The element is closed, the trailing content is discarded, and no\nerror is reported, even though the XML end-tag production allows only optional whitespace after the\nname and both Chromium and Firefox reject such input as `application/xml`. An application that relies\non xmldom to reject not-well-formed input therefore receives a false \"valid\" result for a document the\nspecification and browsers consider malformed.\n\n## Details\n\nAcross every affected version, an end tag whose valid `Name` is followed by trailing content before\n`\u003e` is silently accepted: the element is closed, the residue is dropped, and no error is reported. How\nmuch leaks differs by line (see Affected Versions), but the observable weakness is the same.\n\nOn the current (`0.9.x`) line, the parser validates the end-tag name against the XML `ETag` production\nwith an anchored regular expression (`^ QName S? $`). That expression is compiled with the `m`\n(multiline) flag by a shared builder, so `$` matches at an interior line terminator: a valid name on\nthe first line satisfies the anchored production and any content after the line break escapes the\ncheck. On 0.9.x the whitespace-separated variant (`\u003c/a junk\u003e`) is already rejected; only the\nline-terminator variant leaks. Older lines have no anchored end-tag validator at all, so they accept\nboth the line-terminator and the whitespace variant.\n\nThis is **not** content injection \u2014 the trailing content is dropped, and the resulting DOM is a normal\nsingle-root document (`\u003ca/\u003e`). The security-relevant property is the silent acceptance of\nnot-well-formed input: xmldom\u0027s parse result disagrees with the specification and with browser XML\nparsers, so any control that treats \"xmldom parsed it without error\" as \"well-formed\" is bypassed.\n\n### Root Cause\n\nOn the `0.9.x` line, where the line-terminator variant specifically leaks:\n\n1. A shared regexp builder compiles anchored productions with the `m` flag.\n2. `^\u2026$` under `m` are line anchors, not string anchors.\n3. The anchored end-tag production `^ QName S? $` is therefore satisfied by the first line alone, so\n   trailing content after a line terminator is neither matched nor rejected \u2014 the malformed end tag is\n   accepted and the residue silently discarded.\n\nThe triggering line terminators are the ECMAScript `LineTerminator` set: U+000A, U+000D, U+2028, U+2029.\nU+2028 and U+2029 are not XML whitespace, so they are non-conforming trailing content that nonetheless\nleaks because the JavaScript `$` anchor treats them as line boundaries under `m`.\n\n## Affected Versions\n\nBoth maintained versions are affected and fixed:\n\n- **`0.9.x`** (`\u003e= 0.9.0, \u003c= 0.9.11`) \u2192 **`0.9.12`**: the anchored end-tag validator\u0027s `m` flag leaks\n  the line-terminator variant. The whitespace variant (`\u003c/a junk\u003e`) is already rejected on this line.\n- **`0.8.x`** (`\u003e= 0.8.0, \u003c= 0.8.14`) \u2192 **`0.8.15`**: no anchored end-tag validator at all \u2014 both the\n  line-terminator and the whitespace variant are silently accepted; the fix adds a residue check.\n\n`release-0.7.x` (`\u003c= 0.7.13`) and the unscoped `xmldom` package (range `*`, last release 0.6.0) are\n**affected but will not be patched** \u2014 they are end-of-life / unmaintained. They share the older-line\nbehavior (both variants silently accepted, residue dropped).\n\n## Proof of Concept\n\n```js\nconst { DOMParser, XMLSerializer } = require(\u0027@xmldom/xmldom\u0027);\nconst doc = new DOMParser().parseFromString(\u0027\u003ca\u003e\u003c/a\\njunk\u003e\u0027, \u0027text/xml\u0027); // no error\nconsole.log(new XMLSerializer().serializeToString(doc));\n// Observed: \u003ca/\u003e   \u2014 the malformed end tag is accepted, \"junk\" silently discarded, no error reported.\n// Expected (per XML spec / Chromium / Firefox): a parse error \u2014 the input is not well-formed.\n```\n\n## Impact\n\n- **Silent acceptance of not-well-formed XML**: a document the specification and browser XML parsers\n  reject is parsed without error.\n- **Bypass of a well-formedness / parse-before-trust gate**: an application relying on xmldom to\n  reject malformed input treats such a document as valid. Note this is an input-validation /\n  parser-differential issue, not content injection \u2014 the trailing content is discarded.\n\n## Fix Applied\n\nThe parser now reports a not-well-formed end tag whose valid name is followed by trailing content, on both `0.9.12` and `0.8.15` \u2014 previously it was accepted silently \u2014 and parsing recovers to the byte-identical DOM as before.\\\nOn `0.9.12` the anchored end-tag validator is corrected so a line break followed by trailing content no longer satisfies it, reported as a recoverable `error` when parsing as XML and a `warning` when parsing as HTML.\\\nOn `0.8.15`, which previously performed no end-tag residue validation, an equivalent residue check is added, reported as a recoverable `error` in both XML and HTML.\\\nWell-formed documents are unaffected.\n\nBecause the report is recoverable, the fix is non-breaking: no previously-parsed document begins to\nthrow and no serialized output changes. Consumers that want strict rejection can escalate the reported\n`error` to a fatal one via the parser\u0027s error handler (`onError` in `0.9.12`, `errorHandler` in\n`0.8.15`). The two versions also differ in the whitespace-separated variant (`\u003c/a junk\u003e`): `0.9.12`\nalready rejected it with a fatal error in XML and continues to, while `0.8.15` \u2014 which validated\nneither variant \u2014 now emits the same recoverable report for both the whitespace and line-break\nvariants.\n\n### Residual limitation\n\nBy default the parser still **recovers** (it does not reject the document); the reported condition is a\nrecoverable `error`/`warning`, not a fatal error, to avoid changing the parsed output in a patch\nrelease. Converting this and the other not-well-formed-acceptance cases to a consistent `fatalError` \u2014\nincluding the broader end-tag leniency on the older versions \u2014 is deferred to the next breaking release,\ntracked at [xmldom/xmldom#1074](https://github.com/xmldom/xmldom/issues/1074).",
  "id": "GHSA-6h8r-xr42-gp59",
  "modified": "2026-09-08T21:02:13Z",
  "published": "2026-09-08T21:02:13Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/xmldom/xmldom/security/advisories/GHSA-6h8r-xr42-gp59"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-83611"
    },
    {
      "type": "WEB",
      "url": "https://github.com/xmldom/xmldom/pull/1071"
    },
    {
      "type": "WEB",
      "url": "https://github.com/xmldom/xmldom/pull/1072"
    },
    {
      "type": "WEB",
      "url": "https://github.com/xmldom/xmldom/commit/4430189660b0d380ee9c9ee7550a1358688e8828"
    },
    {
      "type": "WEB",
      "url": "https://github.com/xmldom/xmldom/commit/7b2ec67e1750daadd0bb06c92e875e726544a362"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/xmldom/xmldom"
    },
    {
      "type": "WEB",
      "url": "https://github.com/xmldom/xmldom/releases/tag/0.8.15"
    },
    {
      "type": "WEB",
      "url": "https://github.com/xmldom/xmldom/releases/tag/0.9.12"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "xmldom: Parser silently accepts a not-well-formed end tag whose name is followed by a line break and trailing content"
}

MSRC_CVE-2026-83611

Vulnerability from csaf_microsoft - Published: 2026-09-07 02:02 - Updated: 2026-09-09 01:51

Summary

xmldom: Parser silently accepts a not-well-formed end tag whose name is followed by a line break and trailing content

Scope

1 vulnerability in this advisory, including CVE-2026-83611.

CVE-2026-83611

Known not affected: 1 product

Open the full advisory

UBUNTU-CVE-2026-83611 (CVE-2026-83611)

Vulnerability from osv_ubuntu – Published: 2026-09-01 15:17 – Updated: 2026-09-16 11:43 – Source website

Details

xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. Prior to @xmldom/xmldom versions 0.8.15 and 0.9.12, and in xmldom version 0.6.0 and earlier, DOMParser.parseFromString() can silently accept an end tag such as , close the element, and discard the trailing content. On 0.9.x, the lib/sax.js end-tag validator inherits the multiline flag from reg(), allowing the first line to satisfy the anchored XML ETag production; older lines have no equivalent residue validation. This parser differential can bypass a parse-before-trust well-formedness gate, although it does not inject the discarded content; onError on 0.9.x and errorHandler on 0.8.x are the relevant reporting interfaces. This issue is fixed in @xmldom/xmldom versions 0.8.15 and 0.9.12; no fixed version is available for xmldom.

Severity

6.9 (Medium)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-83611	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-83611	REPORT
	https://github.com/xmldom/xmldom/security/advisor…	REPORT
	https://github.com/xmldom/xmldom/pull/1071	REPORT
	https://github.com/xmldom/xmldom/pull/1072	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "node-xmldom",
            "binary_version": "0.1.27+ds-1+deb10u2build0.20.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "node-xmldom",
        "purl": "pkg:deb/ubuntu/node-xmldom@0.1.27+ds-1+deb10u2build0.20.04.1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.1.27+ds-1",
        "0.1.27+ds-1+deb10u2build0.20.04.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "node-xmldom",
            "binary_version": "0.7.5-1ubuntu0.22.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "node-xmldom",
        "purl": "pkg:deb/ubuntu/node-xmldom@0.7.5-1ubuntu0.22.04.1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.5.0-1",
        "0.7.3-1",
        "0.7.5-1",
        "0.7.5-1ubuntu0.22.04.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "node-xmldom",
            "binary_version": "0.8.6-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "node-xmldom",
        "purl": "pkg:deb/ubuntu/node-xmldom@0.8.6-1?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.8.6-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "node-xmldom",
            "binary_version": "0.9.8-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "node-xmldom",
        "purl": "pkg:deb/ubuntu/node-xmldom@0.9.8-2?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.9.6-1",
        "0.9.8-1",
        "0.9.8-2"
      ]
    }
  ],
  "aliases": [],
  "details": "xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. Prior to @xmldom/xmldom versions 0.8.15 and 0.9.12, and in xmldom version 0.6.0 and earlier, DOMParser.parseFromString() can silently accept an end tag such as \u003c/a\\njunk\u003e, close the element, and discard the trailing content. On 0.9.x, the lib/sax.js end-tag validator inherits the multiline flag from reg(), allowing the first line to satisfy the anchored XML ETag production; older lines have no equivalent residue validation. This parser differential can bypass a parse-before-trust well-formedness gate, although it does not inject the discarded content; onError on 0.9.x and errorHandler on 0.8.x are the relevant reporting interfaces. This issue is fixed in @xmldom/xmldom versions 0.8.15 and 0.9.12; no fixed version is available for xmldom.",
  "id": "UBUNTU-CVE-2026-83611",
  "modified": "2026-09-16T11:43:10Z",
  "published": "2026-09-01T15:17:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-83611"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-83611"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/xmldom/xmldom/security/advisories/GHSA-6h8r-xr42-gp59"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/xmldom/xmldom/pull/1071"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/xmldom/xmldom/pull/1072"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-83611"
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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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.

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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.
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Action not permitted

CVE-2026-83611 (GCVE-0-2026-83611)

CLEANSTART-2026-UU21916 (CVE-2026-83611)

FKIE_CVE-2026-83611

GHSA-6H8R-XR42-GP59

Summary

Details

Root Cause

Affected Versions

Proof of Concept

Impact

Fix Applied

Residual limitation

MSRC_CVE-2026-83611

UBUNTU-CVE-2026-83611 (CVE-2026-83611)

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