Vulnerability-Lookup

CVE-2026-65899 (GCVE-0-2026-65899)

Vulnerability from cvelistv5 – Published: 2026-07-23 13:16 – Updated: 2026-10-08 15:23

Title

DOMPurify before 3.4.9 Trusted Types Policy State Contamination

Summary

DOMPurify 3.0.0 before 3.4.9 does not reset the retained Trusted Types policy when clearConfig() is called, so a DOMPurify instance reused across trust boundaries stays bound to a previously supplied TRUSTED_TYPES_POLICY. A later caller that requests RETURN_TRUSTED_TYPE output receives a TrustedHTML object created by the old (potentially unsafe) policy rather than a clean default, which can lead to script execution at a Trusted Types sink. Passing TRUSTED_TYPES_POLICY: null on the later call also does not clear the retained policy.

Severity

5.1 (Medium)


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

6.1 (Medium)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-27 16:15 UTC

CWE

CWE-693 - Protection Mechanism Failure

Assigner

VulnCheck CNA under the mitre root

CNA scorecard B 84/100 over 6966 records in the last 180 days details

References

3 references

URL	Tags
https://github.com/cure53/DOMPurify/security/advi…	vendor-advisory
https://github.com/cure53/DOMPurify/commit/825e61…	patch
https://www.vulncheck.com/advisories/dompurify-be…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version	CPE status
cure53	DOMPurify	Affected: 0 , < 3.4.9 (semver) Unaffected: 3.4.9 (semver) cpe:2.3:a:cure53:dompurify::::::::

Date Public

2026-06-10 00:00

Credits

offset

Show details on NVD website

JSON

To clipboard

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RHSA-2026:58502

Vulnerability from csaf_redhat - Published: 2026-08-22 14:06 - Updated: 2026-10-22 05:58

Summary

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Severity

Moderate

Scope

4 vulnerabilities in this advisory, including CVE-2026-65899.

CVE-2026-65899

A flaw was found in DOMPurify where the clearConfig() function does not properly reset the retained Trusted Types policy. This can lead to a DOMPurify instance, when reused across different security contexts, remaining bound to a previously supplied and potentially unsafe policy. An attacker could leverage this to execute malicious scripts, resulting in client-side arbitrary code execution.

6.1 (Medium)


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

Fixed: 3 products

https://access.redhat.com/errata/RHSA-2026:58502

Open the full advisory

UBUNTU-CVE-2026-65899 (CVE-2026-65899)

Vulnerability from osv_ubuntu – Published: 2026-07-23 14:18 – Updated: 2026-07-29 08:01 – Source website

Details

Severity

6.1 (Medium)


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

5.1 (Medium)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-65899	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-65899	REPORT
	https://github.com/cure53/DOMPurify/security/advi…	REPORT

JSON

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{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "node-dompurify",
            "binary_version": "2.3.3+dfsg-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "node-dompurify",
        "purl": "pkg:deb/ubuntu/node-dompurify@2.3.3+dfsg-1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.3.0+dfsg-2",
        "2.3.3+dfsg-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "node-dompurify",
            "binary_version": "3.0.9+dfsg+~3.0.5-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "node-dompurify",
        "purl": "pkg:deb/ubuntu/node-dompurify@3.0.9+dfsg+~3.0.5-1?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.4.1+dfsg+~2.4.0-1",
        "3.0.9+dfsg+~3.0.5-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "node-dompurify",
            "binary_version": "3.3.3+dfsg-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "node-dompurify",
        "purl": "pkg:deb/ubuntu/node-dompurify@3.3.3+dfsg-1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.1.7+dfsg+~3.0.5-2",
        "3.3.3+dfsg-1"
      ]
    }
  ],
  "aliases": [],
  "details": "DOMPurify 3.0.0 before 3.4.9 does not reset the retained Trusted Types policy when clearConfig() is called, so a DOMPurify instance reused across trust boundaries stays bound to a previously supplied TRUSTED_TYPES_POLICY. A later caller that requests RETURN_TRUSTED_TYPE output receives a TrustedHTML object created by the old (potentially unsafe) policy rather than a clean default, which can lead to script execution at a Trusted Types sink. Passing TRUSTED_TYPES_POLICY: null on the later call also does not clear the retained policy.",
  "id": "UBUNTU-CVE-2026-65899",
  "modified": "2026-07-29T08:01:44Z",
  "published": "2026-07-23T14:18:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-65899"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-65899"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/cure53/DOMPurify/security/advisories/GHSA-vxr8-fq34-vvx9"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-65899"
  ]
}

Sightings

Author	Source	Type	Date	Other

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Confirmed: The vulnerability has been validated from an analyst's perspective.
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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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CVE-2026-65899 (GCVE-0-2026-65899)

RHSA-2026:58502

UBUNTU-CVE-2026-65899 (CVE-2026-65899)

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