CVE-2025-15104: Vnu jar Nu Html Checker (vnu) Contains Vulnerability

MODERATE
Advisory Identifier: GHSA-fccg-7w3p-w66f
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CWE-918
Published
Advisory Summary

CVE-2025-15104 is a MODERATE nu html checker (vnu) contains vulnerability (CWE-918: Server-Side Request Forgery (SSRF)) affecting Vnu jar libraries in the npm ecosystem. The issue involves nu html checker (vnu) contains a server-side request forgery (ssrf) vulnerability. Remediation is available in the latest vendor maintenance releases.

CVE-2025-15104 at a Glance

CVE Identifier CVE-2025-15104
GHSA Identifier GHSA-fccg-7w3p-w66f
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-918: Server-Side Request Forgery (SSRF)
Affected Product Vnu jar
Package Ecosystem npm
Published Date
Last Updated

How to Fix CVE-2025-15104

To remediate this vulnerability, upgrade all affected Vnu jar dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

vnu-jar fixed: Latest secure release 
npm install vnu-jar@Latest secure release
nu.validator:validator fixed: Latest secure release 
<dependency>
    <groupId>nu.validator</groupId>
    <artifactId>validator</artifactId>
    <version>Latest secure release</version>
</dependency>
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

npm ls vnu-jar

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2025-15104, inspect your project dependencies using npm:

npm ls vnu-jar

Analyze the terminal output to locate any version of Vnu jar in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The npm ls vnu-jar command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-918: Server-Side Request Forgery (SSRF), where the web server receives a url or similar request from an upstream component and retrieves the contents of this url, but it does not sufficiently ensure that the request is being sent to the expected destination. In Vnu jar, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

Nu Html Checker (validator.nu) contains a restriction bypass that allows remote attackers to make the server perform arbitrary HTTP/HTTPS requests to internal resources, including localhost services. While the validator implements hostname-based protections to block direct access to localhost and 127.0.0.1, these controls can be bypassed using DNS rebinding techniques or domains that resolve to loopback addresses.This issue affects The Nu Html Checker (vnu): latest (commit 23f090a11bab8d0d4e698f1ffc197a4fe226a9cd).

CVE-2025-15104 Affected Vnu jar Versions

2 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
vnu-jar
npm/vnu-jar
npm
≤ 26.1.11
nu.validator:validator
maven/nu.validator/validator
Maven
≤ 26.1.11

References

NVD — CVE-2025-15104 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-15104
fluidattacks.com/advisories/europe WEB
https://fluidattacks.com/advisories/europe
Vnu jar Source Repository REPOSITORY
https://github.com/validator/validator

Frequently Asked Questions

What is CVE-2025-15104?
CVE-2025-15104 is a security vulnerability in Vnu jar involving Nu Html Checker (vnu) contains a Server-Side Request Forgery (SSRF) vulnerability under CWE-918: Server-Side Request Forgery (SSRF).
Which Vnu jar versions are affected?
Affected versions include releases prior to current release patches across affected packages: vnu-jar, nu.validator:validator.
What version fixes CVE-2025-15104?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is vnu-jar affected?
Yes, vnu-jar is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
Is validator affected?
Yes, nu.validator:validator is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What CWE is associated with CVE-2025-15104?
CVE-2025-15104 is classified under CWE-918: Server-Side Request Forgery (SSRF) (The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.).
How can I check npm dependencies for CVE-2025-15104?
Run the dependency tree command: 'npm ls vnu-jar'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-fccg-7w3p-w66f",
  "modified" : "2026-01-16T19:57:33Z",
  "published" : "2026-01-16T15:31:25Z",
  "aliases" : [ "CVE-2025-15104" ],
  "summary" : "Nu Html Checker (vnu) contains a Server-Side Request Forgery (SSRF) vulnerability",
  "details" : "Nu Html Checker (validator.nu) contains a restriction bypass that allows remote attackers to make the server perform arbitrary HTTP/HTTPS requests to internal resources, including localhost services. While the validator implements hostname-based protections to block direct access to localhost and 127.0.0.1, these controls can be bypassed using DNS rebinding techniques or domains that resolve to loopback addresses.This issue affects The Nu Html Checker (vnu): latest (commit 23f090a11bab8d0d4e698f1ffc197a4fe226a9cd).",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N/E:P"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "nu.validator:validator"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "26.1.11"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "vnu-jar"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "26.1.11"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-15104"
  }, {
    "type" : "WEB",
    "url" : "https://fluidattacks.com/advisories/europe"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/validator/validator"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-918" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-01-16T19:57:33Z",
    "nvd_published_at" : "2026-01-16T14:15:54Z"
  }
}