CVE-2025-45526: Withdrawn Advisory Denial of Service Vulnerability

LOW
Advisory Identifier: GHSA-wgc6-9f6w-h8hx
Share
CWE-770
Published
Advisory Summary

CVE-2025-45526 is a LOW denial of service vulnerability (CWE-770: Allocation of Resources Without Limits or Throttling) affecting Withdrawn Advisory libraries in the npm ecosystem. The issue involves microlight allows a denial of service. Remediation is available in the latest vendor maintenance releases.

CVE-2025-45526 at a Glance

CVE Identifier CVE-2025-45526
GHSA Identifier GHSA-wgc6-9f6w-h8hx
Severity LOW
CVSS v3.1 Base Score N/A
CWE Classification CWE-770: Allocation of Resources Without Limits or Throttling
Affected Product Withdrawn Advisory
Package Ecosystem npm
Published Date
Last Updated

How to Fix CVE-2025-45526

To remediate this vulnerability, upgrade all affected Withdrawn Advisory dependencies to a patched release.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

microlight fixed: Latest secure release 
npm install microlight@Latest secure release
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 microlight

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2025-45526, inspect your project dependencies using npm:

npm ls microlight

Analyze the terminal output to locate any version of Withdrawn Advisory in your dependency tree.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 microlight 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-770: Allocation of Resources Without Limits or Throttling, where the product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated. In Withdrawn Advisory, software state validation or input boundaries are circumvented during processing.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

## Withdrawn Advisory This advisory has been withdrawn because the proof of concept does not demonstrate a practical security impact. This link is maintained to preserve external references. ## Original Description A denial of service (DoS) vulnerability has been identified in the JavaScript library microlight version 0.0.7. This library, used for syntax highlighting, does not limit the size of textual content it processes in HTML elements with the microlight class. When excessively large content (e.g., 100 million characters) is processed, the reset function in microlight.js consumes excessive memory and CPU resources, causing browser crashes or unresponsiveness. An attacker can exploit this vulnerability by tricking a user into visiting a malicious web page containing a microlight element with large content, resulting in a denial of service.

CVE-2025-45526 Affected Withdrawn Advisory Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
microlight
npm/microlight
npm
≤ 0.0.7

References

NVD — CVE-2025-45526 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-45526
Withdrawn Advisory Source Repository REPOSITORY
https://github.com/github/advisory-database/pull/5730
Withdrawn Advisory Source Repository REPOSITORY
https://gist.github.com/Rootingg/483b09b760d031b62b172f2153f3ed2a
Withdrawn Advisory Source Repository REPOSITORY
https://github.com/asvd/microlight

Frequently Asked Questions

What is CVE-2025-45526?
CVE-2025-45526 is a security vulnerability in Withdrawn Advisory involving microlight allows a denial of service under CWE-770: Allocation of Resources Without Limits or Throttling.
Which Withdrawn Advisory versions are affected?
Affected versions include releases prior to current release patches across affected packages: microlight.
What version fixes CVE-2025-45526?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is microlight affected?
Yes, microlight is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What CWE is associated with CVE-2025-45526?
CVE-2025-45526 is classified under CWE-770: Allocation of Resources Without Limits or Throttling (The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.).
How can I check npm dependencies for CVE-2025-45526?
Run the dependency tree command: 'npm ls microlight'. 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-wgc6-9f6w-h8hx",
  "modified" : "2025-06-18T17:11:34Z",
  "published" : "2025-06-17T21:32:30Z",
  "withdrawn" : "2025-06-18T17:11:34Z",
  "aliases" : [ "CVE-2025-45526" ],
  "summary" : "Withdrawn Advisory: microlight allows a denial of service",
  "details" : "## Withdrawn Advisory\nThis advisory has been withdrawn because the proof of concept does not demonstrate a practical security impact. This link is maintained to preserve external references.\n\n## Original Description\nA denial of service (DoS) vulnerability has been identified in the JavaScript library microlight version 0.0.7. This library, used for syntax highlighting, does not limit the size of textual content it processes in HTML elements with the microlight class. When excessively large content (e.g., 100 million characters) is processed, the reset function in microlight.js consumes excessive memory and CPU resources, causing browser crashes or unresponsiveness. An attacker can exploit this vulnerability by tricking a user into visiting a malicious web page containing a microlight element with large content, resulting in a denial of service.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "microlight"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "0.0.7"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-45526"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/github/advisory-database/pull/5730"
  }, {
    "type" : "WEB",
    "url" : "https://gist.github.com/Rootingg/483b09b760d031b62b172f2153f3ed2a"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/asvd/microlight"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-770" ],
    "severity" : "LOW",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-06-17T22:36:41Z",
    "nvd_published_at" : "2025-06-17T20:15:32Z"
  }
}