Vulnerability-Lookup

CVE-2026-61704 (GCVE-0-2026-61704)

Vulnerability from cvelistv5 – Published: 2026-08-20 16:21 – Updated: 2026-08-25 15:03

Title

link-preview-js DNS Rebinding SSRF Bypass / Incomplete Fix for CVE-2026-43897

Summary

Link Preview JS extracts web links information. Prior to 4.0.4, the resolveDNSHost mitigation in index.ts validates one resolved IP address but fetches the original hostname, allowing an attacker-controlled DNS server to return a public address during validation and a loopback or internal address during the final connection. This DNS rebinding condition bypasses the SSRF protection and can cause the server-side preview fetch to reach internal HTTP resources. Redirect handling is affected by the same validation-to-fetch mismatch. This issue is fixed in version 4.0.4.

Severity

7.5 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-25 15:03 UTC

CWE

CWE-918 - Server-Side Request Forgery (SSRF)

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7797 records in the last 180 days details

References

5 references

URL	Tags
https://github.com/OP-Engineering/link-preview-js…	x_refsource_CONFIRM
https://github.com/OP-Engineering/link-preview-js…	x_refsource_MISC
https://github.com/OP-Engineering/link-preview-js…	x_refsource_MISC
https://github.com/OP-Engineering/link-preview-js…	x_refsource_MISC
https://github.com/OP-Engineering/link-preview-js…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
OP-Engineering	link-preview-js	Affected: < 4.0.4	guessed

Show details on NVD website

JSON

To clipboard

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}

FKIE_CVE-2026-61704

Vulnerability from fkie_nvd - Published: 2026-08-20 17:18 - Updated: 2026-10-18 20:10

Severity

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/OP-Engineering/link-preview-js/commit/6ee25043dd60b097eb70b4ce049aac94b28239e3
	security-advisories@github.com	https://github.com/OP-Engineering/link-preview-js/commit/f3a3dd84adbb9d32d06a933f44ff3eaa837f9a12
	security-advisories@github.com	https://github.com/OP-Engineering/link-preview-js/pull/181
	security-advisories@github.com	https://github.com/OP-Engineering/link-preview-js/releases/tag/4.0.4
	security-advisories@github.com	https://github.com/OP-Engineering/link-preview-js/security/advisories/GHSA-cpjf-6666-r8fx

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
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      "affectedData": [
        {
          "product": "link-preview-js",
          "vendor": "OP-Engineering",
          "versions": [
            {
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    },
    {
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      "value": "Link Preview JS extrae informaci\u00f3n de enlaces web. Antes de la versi\u00f3n 4.0.4, la mitigaci\u00f3n resolveDNSHost en index.ts valida una direcci\u00f3n IP resuelta pero obtiene el nombre de host original, permitiendo que un servidor DNS controlado por un atacante devuelva una direcci\u00f3n p\u00fablica durante la validaci\u00f3n y una direcci\u00f3n de bucle invertido o interna durante la conexi\u00f3n final. Esta condici\u00f3n de revinculaci\u00f3n de DNS elude la protecci\u00f3n SSRF y puede hacer que la obtenci\u00f3n de la vista previa del lado del servidor alcance recursos HTTP internos. El manejo de redirecciones se ve afectado por la misma falta de coincidencia entre validaci\u00f3n y obtenci\u00f3n. Este problema est\u00e1 solucionado en la versi\u00f3n 4.0.4."
    }
  ],
  "id": "CVE-2026-61704",
  "lastModified": "2026-10-18T20:10:00.110",
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}

GHSA-CPJF-6666-R8FX

Vulnerability from github – Published: 2026-09-02 21:29 – Updated: 2026-09-02 21:29

Summary

link-preview-js DNS Rebinding SSRF Bypass / Incomplete Fix for CVE-2026-43897

Details

The existing advisory GHSA-4gp8-rjrq-ch6q / CVE-2026-43897 states that the SSRF issue was fixed in 4.0.1. However, 4.0.3 remains bypassable when the documented resolveDNSHost mitigation is used.

Root cause: The library validates one resolved IP address through resolveDNSHost, but later performs fetch() against the original hostname without pinning the connection to the validated IP. An attacker-controlled DNS server can return a public IP during validation and a loopback/internal IP during the final connection.

Impact: This allows an attacker to bypass the documented SSRF mitigation and make the server-side fetch reach loopback or internal addresses under DNS rebinding conditions.

This appears to be either an incomplete fix for CVE-2026-43897 or a new DNS rebinding SSRF bypass affecting the latest version.

The PoC was reproduced in a local-only controlled environment to avoid targeting production or third-party systems. Evidence and reproduction details can be provided privately.

Severity

7.5 (High)


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

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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 4.0.3"
      },
      "package": {
        "ecosystem": "npm",
        "name": "link-preview-js"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.0.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-61704"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-918"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-02T21:29:57Z",
    "nvd_published_at": "2026-08-20T17:18:51Z",
    "severity": "HIGH"
  },
  "details": "The existing advisory GHSA-4gp8-rjrq-ch6q / CVE-2026-43897 states that the SSRF issue was fixed in 4.0.1. However, 4.0.3 remains bypassable when the documented resolveDNSHost mitigation is used.\n\nRoot cause:\nThe library validates one resolved IP address through resolveDNSHost, but later performs fetch() against the original hostname without pinning the connection to the validated IP. An attacker-controlled DNS server can return a public IP during validation and a loopback/internal IP during the final connection.\n\nImpact:\nThis allows an attacker to bypass the documented SSRF mitigation and make the server-side fetch reach loopback or internal addresses under DNS rebinding conditions.\n\nThis appears to be either an incomplete fix for CVE-2026-43897 or a new DNS rebinding SSRF bypass affecting the latest version.\n\nThe PoC was reproduced in a local-only controlled environment to avoid targeting production or third-party systems. Evidence and reproduction details can be provided privately.",
  "id": "GHSA-cpjf-6666-r8fx",
  "modified": "2026-09-02T21:29:57Z",
  "published": "2026-09-02T21:29:57Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/OP-Engineering/link-preview-js/security/advisories/GHSA-cpjf-6666-r8fx"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-61704"
    },
    {
      "type": "WEB",
      "url": "https://github.com/OP-Engineering/link-preview-js/pull/181"
    },
    {
      "type": "WEB",
      "url": "https://github.com/OP-Engineering/link-preview-js/commit/6ee25043dd60b097eb70b4ce049aac94b28239e3"
    },
    {
      "type": "WEB",
      "url": "https://github.com/OP-Engineering/link-preview-js/commit/f3a3dd84adbb9d32d06a933f44ff3eaa837f9a12"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/OP-Engineering/link-preview-js"
    },
    {
      "type": "WEB",
      "url": "https://github.com/OP-Engineering/link-preview-js/releases/tag/4.0.4"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "link-preview-js DNS Rebinding SSRF Bypass / Incomplete Fix for CVE-2026-43897"
}

Sightings

Author	Source	Type	Date	Other

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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-2026-61704 (GCVE-0-2026-61704)

FKIE_CVE-2026-61704

GHSA-CPJF-6666-R8FX

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